Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c60101eaf4107a…

MALICIOUS

PDF

92.4 KB Created: 2021-06-25 13:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 191b63857ac59a493b5ada6308a40a99 SHA-1: 0690628597a3e65f28e9d28ad6ffe76e9afdd496 SHA-256: 28c60101eaf4107a1637b10bc9e497449fd00e17b2a1f53eb7cf540ebef627e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://akicgiyim.com/userfiles/file/21926665448.pdf
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/3781022267.pdf
    • https://akproauto.net/nbloom/fckuploads/file/83639412614.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31cd12823e---2815851838.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608223cab4984---63172877939.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a9609d13bbb93087dbd3a0c12b751cc/zoned.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/840abee11fc30e4fc86dd6f21fb6e463/20484389087.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mcio4p3cs1to5u0oc9skfic4r/67573120453.pdf
    • https://drivetripper.com/userfiles2020/files/6963863203.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e8e93e3b84e400f31e8d46fbb2831dd7/16235931489.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b634997e7d3---lolidoxuwupul.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a8cbf1bccb087e2ffc243bf47ad35be0/pogilufajete.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417f2278ad---75240428073.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/56385439053.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/gobetaloxemaketamemuxim.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b75dbee8b---nasokezijarematokasosawu.pdf
    • http://quick-thailand.com/images/uploads/file/7212903634.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0488eefa---silukudekifuwitipudanexag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=qibla+direction+online+check
    • 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_off0001080a.bin
c9ec2b334efec0a9e99f65715abca98b77c3e8cddc602a4f7fdff2f61de08224
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 17156 bytes
font_01_sfnt_off000134d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16792 bytes
font_02_sfnt_off00014ce9.bin
4c6844fd77663465c0bde38025fdf320b3cb409998f5f2c7e16f4da91ee82567
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 10592 bytes