Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd029c08ef773330…

MALICIOUS

PDF

95.3 KB Created: 2021-09-09 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f59f57db620e9536a606e478689855e SHA-1: bd3ac1b63eb7220f59d4ee242aaf58ce012edeba SHA-256: bd029c08ef773330d9519db243638e36e9aad0fa18b0131474332f05bc01cef4
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it uses a browser extension installation lure. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the 'SE_BROWSER_INSTALL_LURE' heuristic strongly implies the document's content is designed to deceive users into downloading and executing malicious code, likely via a crafted link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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=download+kawaks+emulator+for+android PDF link annotation
    • http://dailycan.com/userfiles/files/63322903301.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m8aqofm5l26t9eustretffqrqo/98223934309.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/juvedepowotifofutite.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/wivaligux.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/15626823553.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161349ce01585b---24138890795.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/12491912952.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/90165272558.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/7830312405.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/lafoxanofukakulekugitosof.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/40867492669.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/gowiwiradopigotevo.pdfIn PDF document text
    • http://watch62.ru/files/files/84961775812.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/13309210856.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rurojesofazobumuvejuged.pdfIn PDF document text
    • http://uco-kampen.com/media/files/46873196342.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/31573848291.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d1ce65794dae6e2635315b64ad301d2/93309723869.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b71ab0c78---75950251282.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6f366eec031970ba730c6e2ede0d827c/97994109975.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21e72538---33010027607.pdfIn PDF document text
    • https://esvigo.com/upload/files/39112234003.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/pibakosewu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 21668 bytes
SHA-256: 2ad21f147b948e8e11a1a526ab1e8d3156f9c5ba5db596e2b95d55b7008985da
font_01_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B0 10796 bytes
SHA-256: 699f602f85b15e6dd34bcafbad1bf1662bb4e15a4efef968c090fe2d0cbe45f1
font_03_sfnt_off00015998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15998 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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