Malicious PDF — malware analysis report

Static analysis result for SHA-256 2162ab1d7ab66b41…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 20:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f1319017c822f2da0210365ca4e7280 SHA-1: 970cdf5e4a3655ebd7417542993da63c521c8199 SHA-256: 2162ab1d7ab66b4104f24fff1bf2945505c4b6c489cf9c5016d10d96d29c8108
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate the PDF is designed to host links on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ediljolli.com/userfiles/files/luwatenonosit.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/04937954242fdbb066ca928d88978228/relagomilopirinebuboxaj.pdf
    • http://hulstcustoms.ru/uploads/files/86794880787.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/tawezimidubopikomaka.pdf
    • https://bahceneryaman.net/public/content-images/files/62004644349.pdf
    • https://108pizza.pl/uploads/userfiles/files/gedewerowe.pdf
    • http://ondamarinarest.com/upload/files/suwuro.pdf
    • http://begemot-rus.com/uploadfiles/file/2021091414072273499.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/98072999344.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/66384775162.pdf
    • http://udelimpa.es/ckfinder/userfiles/files/nakolozi.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/40373087709.pdf
    • https://mldom.xyz/web/img/podborky/files/sotuzovomoximomavebapami.pdf
    • https://www.xyoaa.org/sites/default/files/files/28705881128.pdf
    • https://samudra99.com/contents/files/dotagaw.pdf
    • http://chetaomaynganhnhua.com/uploads/files/44271659891.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nuwanewunuwixadusipipe.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149dc0366795---mugidimuxeximiva.pdf
    • https://srsatta.com/ckfinder/userfiles/files/39745739082.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/nusogel.pdf
    • https://renetravel.ro/images/files/sojifoxej.pdf
    • https://guanlai.tw/uploads/files/202109192313482610.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7031vr8jagrt86h6qmfj6o4qbs/5948067667.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/41eh9gichbuinvvodjfs4f5921/wuvewagawoponiw.pdf
    • http://c2ctrading.org/cms_upload/files/gubixiw.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=berserk+manga+download+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_off0000bdc6.bin
8aa0072099514acc9b8a86ad1d17658a008238686bec6bb676d87a9109babff1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 10880 bytes
font_01_sfnt_off0000d6cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16792 bytes
font_02_sfnt_off0000eee1.bin
6ca6d13917ab22f8805befedc307b9bdfbeba70910725b10289d88244e1f9804
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 19724 bytes