Malicious PDF — malware analysis report

Static analysis result for SHA-256 529705fce9bb5bea…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 10:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01db6b384ab2b6f918b42cee97a945c8 SHA-1: 7293dd70048c99ab18ff634e829aa55bd149cdfd SHA-256: 529705fce9bb5beabe02e299b046752c411ddcfc8de3e51febf18aaca65ed373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may contain embedded JavaScript or exploit content to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://auxerretv.com/content/public/file/87506496689.pdf In PDF document text
    • http://mp-journal.com/media/file/luxejemanunuzu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pakorupawofiloxitupeve.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6mjf69vtgitgh5its30lktfm92/tenibelibo.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/puvimedusa.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/21561637617.pdfIn PDF document text
    • https://topupdana.com/contents//files/leworaledexexojuluxi.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/ralipavesopusavojil.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160767a7c179f9---viragewubasaxalusowodepi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/78142055553.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pojimijadipowuxesumusid.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4fuldgohhrhshh6rr0iuc03dlp/80882245534.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/susaderupidadajoju.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/298c2297a716e9a01e222945b28dafb0/jupatuzonetogeka.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/g99fla1r96mm09sclfjknngqjb/jewetitopafiwuwikuwa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af82d051487---84516153626.pdfIn PDF document text
    • https://sealskinz.ru/files/file/35770478263.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c39aa324---40802516527.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/83739392254.pdfIn PDF document text
    • http://mousike.it/img_ins/files/senov.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/fupixut.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hnf68ap8a2fvufhh1es6sgcsh1/35337926655.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d825a32e3f08128526164692e0aa5e74/bujararejitunij.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc860b3c5---digavifim.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca273932ad---vegigakobamegid.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fa8de47a---15379983568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cost+to+mow+2+acresPDF link annotation
    • 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_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 17128 bytes
SHA-256: 7be880f022fb0e784258e69338e747d4d10524ddb93a912acf10bcb613f59fb8
font_01_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10384 bytes
SHA-256: 1f2dfb6deccf90b3e17ec07eb43f6d7c86c98f12dd0a8cbb3599f22fc10e28ce
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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