Malicious PDF — malware analysis report

Static analysis result for SHA-256 df61000343590b53…

MALICIOUS

PDF

84.6 KB Created: 2021-08-13 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 24d5fe24734fa8b076136ce7ad12e4c2 SHA-1: 5dee105ed4d7b6620b4c3062dba47e38a193cd68 SHA-256: df61000343590b53332689e8b619e6e5c1f1bc69588d12280749e4a057eed790
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a4e6fe780f4d3803550677d816665969/bogobonuxovabafe.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115c6874dc1---59831707506.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/suwutelutu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608697e53ec10---36380173552.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d3fa97db0cedf9cf873f6435eaf175a2/13307809756.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/740dc0db67820ac402579b629823ede8/24917029791.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nowozoseger.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/pelote.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vugitimufuxapirumew.pdfIn PDF document text
    • http://candientuvibra.com/images/file/73135529343.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/06dd706946a00f2e1b27d5baaf0157ff/zebaxuxavubexawane.pdfIn PDF document text
    • http://guchenes.com/d/files/goveb.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1628581848.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tuzipexebuxomoxo.pdfIn PDF document text
    • http://tayles.com/uploaded/97417677234.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsikaplb3evjoudr2b3msl69p6/7684856307.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca825955f1---salezopovema.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xobag.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0731df201---raguxuxosagovusefi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/tixigodimebovije.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98277734415fad30f8f1ab6015534636/96035310138.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/67490698814.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/funinitidinoterete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=whatsapp+dikhao+download+karna+haiPDF 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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 10528 bytes
SHA-256: eae11dc7e69f1b59dc86cccfcceb7541fae85dd2eae6d404df0616b4c3149544
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 16328 bytes
SHA-256: 7618047e559980969df980f08aa9d6bb2f20dc692c8e6bc010ce8fd2f6104be2