Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aeaa9fd6589b36…

MALICIOUS

PDF

71.9 KB Created: 2021-06-30 02:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c219bb4509b14351c4116b450501b1e SHA-1: 5485d0a4b5dcce05fd286311a5aff2216e2a6aa4 SHA-256: a6aeaa9fd6589b3665bad71ee3eceb98e33950799a2c4f567cf2ea6a8d5f8f9d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs are sufficient evidence of a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://grabnerestriche.at/68938337607.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qd69io9si9cm8kbr9brc1mc9ke/kobalorojogu.pdf
    • http://www.css-jp.com/upfile/files/2021/06/20/numujejujimo.pdf
    • http://cariboohose.com/userfiles/file/82993572979.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3ce397308a6dcf2656171f10b5b88124/90035162263.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86e080eb549901e15fb68cfdb9242c03/jajenigepekaziwemexol.pdf
    • http://lab4050.com/upload/editor/file/malininas.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/np3p5c3bk7pja1ed2as6lkmoo5/74529046259.pdf
    • http://robalton.es/Albums/images/file///dufamomavegenepodo.pdf
    • http://vladjurnalist.ru/archive/file/27621839315.pdf
    • http://dermalab.pl/userfiles/file/niwasa.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/m1mg2a4emanom4fgr2dudui4gt/bozilenavipunupaf.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e17930287---4838119790.pdf
    • http://murphysbeads.com/clients/54316/File/99058624556.pdf
    • http://nextgenship.net/upload/file/20210518162136568533.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c51a3115c---witetiku.pdf
    • http://aldara-latinoamerica.com/userfiles/file/62602951562.pdf
    • http://wo-kop.pl/userfiles/file/86377628035.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v47dev984s2bb2vdrnntnv3btp/55388933233.pdf
    • http://anhbanglaw.com/userfiles/file/43611559754.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c662b985f60---67098246954.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chez+elle+cr%C3%AAperie+and+coffeehouse
    • 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_off0000b69b.bin
17fb0bd3f55db579f438b19dda345d34d6a53d44a7638ed1c31fbc860b5fb9cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 10968 bytes
font_01_sfnt_off0000cfbb.bin
4d0d81c2df0b2564b989df393e107089c49642fcbd4d2413eaf354d3d0a068d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 16460 bytes
font_02_sfnt_off0000f8a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 16792 bytes