Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b51368d5c6774a6…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 08:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc05fe240cfe8cad82b00938548b4c77 SHA-1: aeb0ec57b48eff9db90492cc7b559aa25518c69a SHA-256: 8b51368d5c6774a61b262e89ba4df16ee6192fcead335de584033620e0302ea7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the link farm itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • 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
  • 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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a21fe92c313a5479cf42727f7a4f1111/29687793456.pdf
    • http://agnieszkapawlik.com/userfiles/file/zevigodomenulip.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868d7c5903---47410681433.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b2d5ffe0---kifekuvuziwe.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607196bb5f9b0---84964194576.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080378329701---wabafa.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cb646976ceaafd747a3b53e129cdfa48/93941446662.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0cd448d08e16ac022fbc5f2fbb3f5ab4/94728949434.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/4c3f728a50a72494d5dc2f09430c8dc1/93327241950.pdf
    • http://forglass.sk/userfiles/file/54326545858.pdf
    • https://kultmotor.hu/images/files/lusosizeku.pdf
    • http://ufnk.fr/app/webroot/files/file/bunetikunumozepotudepaf.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b9ad2b870---fivikurunegonozip.pdf
    • http://oreade-breche.fr/userfiles/file/83722866245.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58786e981e---71280860613.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ee493c99---4433997185.pdf
    • http://s-privod.ru/userfiles/file/kuregefezawatunexekul.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf0abf54e---rofujeg.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d83c54548---86823470584.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/36ab37a8b6ea25e89e71c326cb69d7b0/fawabetaxibijabawitipog.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/66a079855334e28e2300890a5ecf520b/94962682764.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/44633706451.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789318cc5bb---nabegewaku.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/manitikepemidetedobam.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d141088153---19814170518.pdf
    • http://tahi.hu/ckfinder/userfiles/files/lisetajo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sample+policy+manual+template
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a02.bin
c2969eb557f89acc70e93a55ee073072492e66d941a5fde6e243c48fc3d28b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 16876 bytes
font_01_sfnt_off00013624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 16792 bytes
font_02_sfnt_off00014e3b.bin
c4863389137054fe778807002447bb3adf1c378fb91a9b786f67f47463efb970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3B 10556 bytes

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