Malicious PDF — malware analysis report

Static analysis result for SHA-256 3270f840965af892…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 594389511feca95e56e507974b50913e SHA-1: b345c3fed9661615f3a24fcca25246e3b7cc703d SHA-256: 3270f840965af89233dbbe040810170991df533ec48e477e36524ef57f90f1ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee6c584f5---feliredinudinilog.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gvf117js0e3eoav90n7sdmo4ot/35300484554.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0fbd0e1c---vinunefik.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdn4lujb30h9d5s6sp9v13thj4/lefawosapiga.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa246a11f43---61314923518.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf02300953---monuwudotaj.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6n03aqrc9dl6njdhdrqva1l9e3/rozitodujekexakevelo.pdf
    • http://dunajecbiala.pl/upload/File/45253062422.pdf
    • http://technoculture.cz/admin/upload/file/92185620887.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8ca14b6---mumixi.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6b0329bd---67261651610.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/69889270806.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4564a3e6---54708363833.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a0b71f7---wulivadokudugolekepejowa.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57e8ef6c3---47725165087.pdf
    • http://nutranghongngoc.com/media/ftp/file/3442521849.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=r+letter+names+for+boy+english
    • 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_off0000e2a7.bin
24129064d3e8a2b92ea07cf8f657037e63fb853c76b4e6f3051c8ed896a7d144
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 16796 bytes
font_01_sfnt_off00010e52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
font_02_sfnt_off00012669.bin
dc1f619e2c457fbff0dc91a61d454322b7078a9d087ff66fc1023f287c02a963
pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10960 bytes