Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9813a63e59d2b69…

MALICIOUS

PDF

87.5 KB Created: 2021-06-19 19:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 719fd0a9874bfa8c321bf73b534418b4 SHA-1: a873d93db6b76f8ec7a42c3b817d6bd2aede6ff3 SHA-256: d9813a63e59d2b6942493a4a25dd6381247e2f54b73ccfeb785e9df78e64ab22
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, acting as a link farm to disguise malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46f5221f9---12730092609.pdf
    • http://shinies.ru/img/lib/file/wigedukojodamefafagabami.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836642d785f---fisemuvi.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665e2a502b---timuf.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e7f14aee---telewoguvakexaf.pdf
    • http://desagresbrts.com/clients/34568/File/xilevumom.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc1ec897b---mujojesi.pdf
    • http://groupkaishan.com/d/files/50457605776.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa6b6106c---pulubafuv.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27ff75fa3---66843671400.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912e423194---40889075473.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160743b0f73c37---1449089057.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/me8pfenuhrac86dufeeqaidjde/38954871989.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/22297881461.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb8932363---2828403780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=accountancy+text+book+class+12+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e5.bin
28b5d4f1b1a1f794ef14d520a2b7a1760abce3158cb100390c905c8d01158623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5600 bytes
font_01_sfnt_off0000f420.bin
5543017616fa9cd2561f058ba9965f0f5329bb8184126714f5dae2502e18e37e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 11184 bytes
font_02_sfnt_off00011a44.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 16164 bytes
font_03_sfnt_off00012f95.bin
2b633fc74a11eb7ef2be640d3415359dff9c28bacafcad5c5b71e8d79b4e9658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 9892 bytes

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