Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54b64e791164978…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 19:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9cf70158db8b83107e64a9263974f37 SHA-1: 68827bea59c6b9265b26461c6a8e16d2205e5538 SHA-256: d54b64e79116497858fd604e53ee6cb534da0f9405a69ec8943d9eb7bfded0cd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f1d6bfc5d1fc40b40395ebe711d5dca7/8851685289.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/fapanorisasawuli.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/zeburowuxonezenixinomigor.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a0d59231e474c0ca48a70c07aa275429/95852193029.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/depiw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab69fb5b50---ganafexu.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/37038071745.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/degutuxomogarir.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3995e05b6e---varesapojag.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/52339595942.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/30177353936.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de095b680---6930988762.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/khed1q5dj9hatnchene86a9717/94999025511.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/34707734627.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/64014006563.pdfIn PDF document text
    • http://hnspkjx.com/d/files/15158602870.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/lobozufa.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/7938618310.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b568e09e332---mifulove.pdfIn PDF document text
    • http://primaneighbors.com/userimages/71156055534.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/t6dk6gas5907deqva7g46qiv5r/41638589749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=one+bedroom+apartments+in+point+fortinPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befea49834635809624d18f5a96829b6/ripokutasutiwe.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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 18040 bytes
SHA-256: 081ca138af1851aa2ec3e7f1ba7633538162c8b1bf244bde169347b0e80a6c8c
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10780 bytes
SHA-256: cbfd2f4cdfc586201cd91a715499a4970054b31f7247277639222f436ea6e5b1