Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4c0b2ac8d2494e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 03:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 469567160cf5e4062ecf0865c9324ab3 SHA-1: b94c9ea1632ca86843a40ecc88c07c5fa38aaca9 SHA-256: 5e4c0b2ac8d2494e0c065e2776e985e4cbd30c4ad9b2786ae4b3a813e1b04411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=application+android+imprimante+hp
    • http://omatsuri.kr/data/userfiles/files/pixozelog.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf2b66851---surobutobituniriw.pdf
    • http://deaprogettazioni.it/userfiles/files/seruratirokozavodobu.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/79169560892.pdf
    • https://balticstroy.com/uploads/files/22876347321.pdf
    • http://105chers.netsociality.com/upload/files/zoxosawolesiwibaliro.pdf
    • http://mebelhotel.ru/images/news/file/tizisotizal.pdf
    • https://vinniescustoms.com/userfiles/files/wikuxudupurudugowapale.pdf
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/jaroxedi.pdf
    • http://universalgroupautos.com/files/others/42937984010.pdf
    • http://poiskvod.ru/images/file/78976448122.pdf
    • http://dotacjedlaoze.pl/userfiles/file/70430414089.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6efca8b3---numesonulizolakul.pdf
    • https://bednidhitraders.com/userfiles/file/1181068301.pdf
    • https://tierlistei.ch/downloads/69478757339.pdf
    • http://sjar-tech.com/uploadfile/file///2021090822084251.pdf
    • https://mobspace.xyz/web/img/podborky/files/20610042103.pdf
    • http://atomiccm.com/userfiles/files/wowoz.pdf
    • http://tupnate.com/ckfinder/userfiles/files/bufaresiw.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/71053139824.pdf
    • http://droneducational.com/admin/userfiles/file/nexawamoxebuvalafibapa.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143910292256---16524052900.pdf
    • https://ijtm.in/userfiles/file/filori.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://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_off0000cfdb.bin
7b99b329b9e968a7a8f500dc2c1b10fa62e712b3879ffcf07ee953319268dd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 10592 bytes
font_01_sfnt_off0000e7da.bin
f7086607e03ee1b40e75779cbde230199fa76369430ef06ece9de479270e8e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 17448 bytes
font_02_sfnt_off0001153b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 16792 bytes

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