Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f0a78a6aad6ae1…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 05:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2c4d68aec044c4446ce7a16cc655af7 SHA-1: 8c7e986a03ec3bcfc35d263bb5b238683d8c58ad SHA-256: c5f0a78a6aad6ae116a7aa4f17f2893cbf21c31c6a7a233d9cd4e4508ad68df7
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. Heuristics indicate the document attempts to lure users into disabling security software and installing a browser extension, a common tactic for credential theft or further infection. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a330bebeae7c294d7b6f2c1ad5142e0f/10826095578.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebfb35797d---33612049638.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd30acc6a8---48312307301.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233cbd0ae67---temibazededujaguxebeximu.pdfIn PDF document text
    • http://stromzeleny.cz/file/40563327071.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zasugebatuz.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/79300002267.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886afebc87e---lekumedukuzemonugavuxur.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9245f1f5---36245494483.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c744879f6be---36201256700.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/vogataramejevezo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d545b83726---64444463740.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vowokofamunaparixoguz.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nimijozetoso.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0hucio541uqogodevkpt3p0frf/73940129529.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/005f3e6adab0e4d134f32bb97428e4da/wofebisibiwisebososatexov.pdfIn PDF document text
    • https://rosycaffe.com/file/pozetesageresulutez.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1d355u7idtng9v9quelt1d0p93/pamaperali.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/147dc83de3dca87a5353a6305aa00c2a/bekazupupadisuzebepazukob.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/42f782cf2e9623a286a9cbd7dae926a0/59221305672.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590f6983c---kuxipemiwowixilew.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/3325728563.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e2109abfecccaef12f4ef439b8928742/sijozizizu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/43822488072.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecd03670---ligid.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/55769544931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=baixar+impressora+pdf+writer+gratisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 19636 bytes
SHA-256: 776195552fd88e258537006d92ac58ed20bba6c6fecc2b1a880db1c8a8371910
font_02_sfnt_off000155ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AE 10932 bytes
SHA-256: 38129c5b93f5c9a67ca7bbb902ab12830936243b00d5d357a10d8db5075afd2b

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