Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a5295252c4bacf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 16:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14f000e15b76d857789b2af96208b39d SHA-1: 0e4c22673637cfe5345c2e798f4a596fcbb62b73 SHA-256: 68a5295252c4bacf87fb2e9e7b0a1d38338742a24ebbccbb9e0d7d97c14f6bba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential harvesting or malware delivery. The presence of numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggests a phishing or spam campaign. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://nomylo.ru/uplcv?utm_term=manually+add+idm+extension+to+opera PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210619_CD8697D86143DEAF.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/31552644538.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085412d3f6d4---92255441830.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160733839be082---sujezumitavokisifuk.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c1badc33---tijoxumozanage.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ee4df1bd---77341953323.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wesawazurudosew.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8ph4rh5cpfhamvhvmm1oevm1d9/dalovivoguwimonasewadofuk.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/bulabub.pdfIn PDF document text
    • http://intertravel.hu/_user/file/xewofigam.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/81677166206.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/2977967398.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/30992406163.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/todedamo.pdfIn PDF document text
    • http://01host.ru/userfiles/files/ranebojugajapesizuseg.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc9f2c455---57526501656.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ed426de3dabd9888f6d87523dc36cf25/8545132793.pdfIn PDF document text
    • http://polletnv.be/uploads/files/fimodutaruzapurakizotito.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b52fa7c4bc4983993bcd56de9cbb877/33553739672.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084a14f73fc6---36393145498.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/24700e1801ac18ec6594deec5b21e3ba/73188809612.pdfIn PDF document text
    • 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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 19968 bytes
SHA-256: 84f1a76517bdc2c44a4e041a36d4cc53db976c8ce4dcef06c10cc12c44dbe026
font_01_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 10864 bytes
SHA-256: d6f4733971e555d193d305684c694557123ed66ceb72277e0456a1a2c75b47fa
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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