Malicious PDF — malware analysis report

Static analysis result for SHA-256 b696ed3a6612c161…

MALICIOUS

PDF

59.9 KB Created: 2021-05-16 16:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4b0b1fd9be84539a6d197cc952ba99b5 SHA-1: 26646659db7e0ad944811cfe09e2d9c783fab854 SHA-256: b696ed3a6612c161d1e62aeff86df26d724ca76e6c39decef0186be7f1303518
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Chemie formeln erstellen' (creating chemistry formulas), likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://crewmak.ru/uplcv?utm_term=chemie+formeln+erstellen PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de6224b033---30888967853.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/kokul.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f433258206---45698653192.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/lokazafakat.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/dfa228835f908700258d6064f45cab49/lobedikakixivudok.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/49be001419ed7ae1c3d168405d5d22b5/22530611897.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c780f18fde---lebomukot.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/1161333841.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cd28glgsjfbts1osb86h5liedn/39039949770.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba1712a1f154fef5698e7899a591c3eb/97718133404.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/9882291224.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a9996ba9bb1c9d2c1815d11e59f580e5/pimodaterefixibigaxa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61e497e1c---woniwirujesiru.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nigu0osfv70fetqpbjns71b2u5/1169925980.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/21185822223.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88145cb9---wotenefak.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d691f57f51bbde8e9716759f5dc72d39/16753753091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 4700 bytes
SHA-256: 4021ef1c363c9abd33ec92e1cc4393031b2c8cd8b89755a7b30f70a87ad1b09e

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