Malicious PDF — malware analysis report

Static analysis result for SHA-256 431a9c006464be0e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 01:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e7125480cc70f36579888c11e6e8f1f SHA-1: a74a8e3c9d6eaee672c5880a751a420de017ab52 SHA-256: 431a9c006464be0ebd3b0a9536178377234229d58f44f667e25af2133222b38b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://drafthe.ru/uplcv?utm_term=umbrage+in+a+sentence PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/31d55a82c5af622a14cb9d097d542594/vuborufusosekewazalebusem.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/nusosasakanuwu.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ronajomazovataluf.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098481c7f932---rotafizolipeto.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metevatenedaxala.pdfIn PDF document text
    • http://schubert-hh.de/image/file/sewuxamegapuvasaxuguxa.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pupepipirojukod.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cbc99759---papate.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/29683691306.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/dugadufupezakaw.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4fcf5dd1e24d6b126e865d69e4167e5f/29145304157.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cb5b422b---9898932442.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/73b3ab80697fc746ee99c5c9b8aec2a3/59141206652.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e075f1a932feb881c65ba9565430528a/62879343700.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zitela.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/zexaseromadavobuwiran.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1cee4ce9a391e95b89e3d8ec0ddf9d40/15452562727.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/kelifoviv.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/sekagen.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/famasujufexeviwit.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/zawaferuviraxika.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611465fedc4cb---jepilusidirekede.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_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 21204 bytes
SHA-256: 51f180a19f35f76248e0f15ca1bd25da1934264e1de0249d5d3f06014b26661c
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 10556 bytes
SHA-256: 61ac69b36601ebd8a7de0618989886bda8a7c0c88bb924301bb3166f4e89c949

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