Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb66c623fea25f5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 033c6b9a84b4d39604dbceef8dfafe9c SHA-1: dfb27f7a9aa1c9cb563c390059ffb81b5533dd40 SHA-256: 4cb66c623fea25f5a8f40c7f559d5c3b0fff0cc5919ce60fb81bd54a231d45c9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The file's structure suggests it's designed to host a link farm, likely to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6393

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4940f8af97---beveruluwamujalizopaf.pdf In PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lofudevop.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/70659187325.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/32306616133.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/714d4e8496d733c4cd1ecf2e96f9ebb9/dulejidokukuwamogumerupa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0a78bbb2---serile.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/33c75ee64e0e89f2c8ae526bff73e2ce/xuvemoxigironivaser.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6d2eaec9d---zevutemevow.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89d9ebd09---bivewo.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/94412951459.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d690389fbf---28768252006.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077882aab185---61855262082.pdfPDF link annotation
    • http://homeshopeez.com/uploaded_files/userfiles/files/84500824898.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d97095e05---pebiwikojifof.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87cf9e6f8---53323434832.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/17692522935.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609054e6a88ef---84033115603.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dedikaludosexolivexuk.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/eb8f5da36756e4e06a8c75746ed0e6c8/lokapitoseb.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc21f04e4ac---lejuzaxozanaliji.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/38608509149.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/761720416.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f7cb9adb---39883541482.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/aa8a415e3ff8f6c16018dadccf5526fe/23164852224.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/80624113024.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/kiwerefefobivajupox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=exposition+for+the+most+dangerous+gamePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11084 bytes
SHA-256: d362a5c8cb0d8f41957fa96156a77fa0c9ea451a04af5517489ce2bcf5fc0c37

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