Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb128999094b68d…

MALICIOUS

PDF

80.3 KB Created: 2021-06-23 21:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9ef89eeda5736b7869a068878e0cc0 SHA-1: 62922d8e5749d5c8d9b1ede1b500f4e488a91ad8 SHA-256: 4bb128999094b68d18128017db79f3660f26f5c95b7de33898cf30c42a134663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to potentially compromised websites, disguised as a manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/k5fdelj0tcg1rjq4tn3jumgned/75673006751.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b95f594ba41218acd8351b492dc74922/virifigogonurok.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7e962477---5872880031.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744527b0e90---gisizuxanixegisi.pdf
    • http://yossy.biz/userfiles/file/lefupavaniw.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/612d8973982f93de3b2f272c660606bc/dupuvarifirajoxoxemo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/n9kglmsh00ankiq90d55bj7bu3/62083373171.pdf
    • https://technische-dokumentation-hoffmann.com/upload/files/45704706126.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/vabawexoxozupalerar.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/79862991435.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdea8998fc---82324708461.pdf
    • https://organicfertilizerproduction.com/d/files/40672994083.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f31319dfced04ae6fff02ce57fb844db/zuzabakogipomutefejazud.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/cbbbe903ac8f3f0318638b50aefcf6c2/43865934622.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d8771b76f1596dcf9697502ed265e28d/pubiza.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/43685127683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sony+str+dh520+manual
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
c99498b914a97e299251d8ef0ce74de1d1b5c1892eb1cde6dcb83c4d25aad1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5384 bytes
font_01_sfnt_off0000ff00.bin
cbb8adc1196927720f6c54b9c07bdd5367deddf254867d675cc886eb12742bad
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 11608 bytes
font_02_sfnt_off00012690.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 4324 bytes