Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d0de30b95e8610…

MALICIOUS

PDF

60.9 KB Created: 2021-05-06 11:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 36c1a06ee30c15109f27effec80269b8 SHA-1: afd9f90735e06c265dd328ac58452b94057069ac SHA-256: c2d0de30b95e86105e403df1ed8d030c7f8f55dc2dd8a3ea60c6a6993831c64b
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it's designed to lead users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The document body is heavily obfuscated and contains metadata, but the primary malicious functionality is derived from the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7927

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8fdf484cbf17b1a0a44a4f9132e99480/gebonoviduwezasikuwosepa.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1c735c8d3---43923175967.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7fd893479---mafikibir.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cda726858---pexavuguwifonojibew.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cdk5tjbvv6frovln3ntc75acc4/xozotevutijazinisetolebul.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1823db1e4---kutirakapikudogozar.pdfIn PDF document text
    • http://simonide.org/userfiles/file/semufez.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6bhnesaiqg25e8viogi1tn4rkb/10649113152.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0c2e5257b28e954a5e92434cec5b2cd4/disugonudazotawewivoxuza.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/82fe2de143ffb42be3e025984f439c41/72207446085.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/vj8i1rhp4nee4d7bdqhv46vgl4/linobolafoj.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kevadezopevaru.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a9a2edfa9b10194fa8d884c6475f6b97/gupudibevowurogegamu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730ed65a27---xofebapasuburuxalefasup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=partners+in+performance+linkedinPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5368 bytes
SHA-256: a9b0764e6c931554754f96744a7b1463dd30220f1d5e4843317be0f9e723f733

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