Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abb21a9176736ab…

MALICIOUS

PDF

75.9 KB Created: 2021-08-30 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d39457b924918e05576af0856c388aad SHA-1: adfed63654e196126ff5cc406bfff2ee128abee5 SHA-256: 3abb21a9176736ab7f3c68ead197d3d90d9dc5c8b573ba17fbbf3edd7074da10
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, several of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d89d5c824aa5413c45b31f7f7c44275c/48202870526.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/277cd88c296ef5116bb079a5ddb84a98/tilumepufiberiverekakubi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/dogibubabisuru.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afec995f286---jetunefegivovef.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/30030770623.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078fedbc08b7---67008270090.pdfIn PDF document text
    • http://cpils.com/userfiles/file/susuxubetulilokufadok.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/wodevum.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/fopunumodo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2529982858.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a315263be11---fizopelurimumaxujelig.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7f2973f7d295d1170beb6afea4b5be1a/2911270380.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/zenawiwe.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/88598288230.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/6666777630.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd64f06a409---rakutizunuxulu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0ab1cdeed---38401885855.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/75479472389.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/80940402962.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/82430861989.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7dcbd4ccf5bdb1988e3c0a0b219fd837/85568088338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+roost+wineryPDF 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_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 17004 bytes
SHA-256: 75750fe7e4ddda117b7ff00e51033ca1a03054f213ed45ccfe32c4ae9aee3a77
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10160 bytes
SHA-256: 60428a263eb892b67b9f37781c90d528c021cdf195e19571f473c910a5dd88e0
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1