Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6146fdef5698a4…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 11:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a1ff51bf798f9da99e22769312854a3 SHA-1: 30d357b5057b0f7cf33ff1f13fa1dd923325cf85 SHA-256: 9d6146fdef5698a4a835973b3e80e066df050aac74d90690ba7da6b666b92c55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links are likely designed to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=pa+ready+index
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/daarprr9l2cj8vr1offft6an61/85199830818.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2f001193---25298534739.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fffe02156120b4be574a5ed43d8eb5da/90369697528.pdf
    • http://datavincity.com/uploads/ckfinder/files/pikefolo.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4isa2fqkdp57rls6q8uii3t03o/59087086707.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe44ee64b---nuzuwapobubamuzir.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c17e3108f85bc8b97c6cded91ba3820f/kebowobunupetapubex.pdf
    • http://chicohigh1987.com/clients/47015/File/wowelili.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a88ea3188---3538991905.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091991d2ec0b---66188422313.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f140552a3d---vuvosobijasurun.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nagik.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sr3refdof2b4oambc3f94t46t1/pufegamileseketewirav.pdf
    • https://sasalidayanisma.org/uploads/file/susifaponarevobi.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7111c9a80a---56045316638.pdf
    • https://cortopolis.ar/userfiles/file/gubozetilisubopusu.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/dbbvceggkoukmffn64sb41prc6/69808607299.pdf
    • https://planet-for-events.de/userfiles/file/vemadi.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/23861045411.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/229b91b0a938958a5c32cd080ff8f869/34237336862.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608414aa9cf2f---75921941135.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/iq6q483dn6i8hlbfm9psmo8d9j/98510793464.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c73c3b66e0a---9053646266.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607935bfca467---sujorovodujagat.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e9ab173c532f04d9865552b3a1ace15d/17542540470.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_off0000f5a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16792 bytes
font_01_sfnt_off00010dba.bin
a192909bdda7701e9cd12fc8a534706e937950be11535486abf657494b92b6ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 10024 bytes
font_02_sfnt_off00012406.bin
b44991a3e9a316af720d10ab4f7c1fe88e31afaeae874ed4aa71fef9baed767c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 17276 bytes