Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e66ad1fbae3082…

MALICIOUS

PDF

72.5 KB Created: 2021-05-16 17:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbf0bae376271bf8808193010eade5e SHA-1: bbcc42af28880e222c8723f5eeff3a1229373532 SHA-256: a3e66ad1fbae308217ae3e5776cc86d102e5a17d8771b868b0de05da9f4f7807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content. The embedded URLs and the PDF structure indicate a phishing or malware distribution lure.

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ro74r6g8n9i2lm39hdpnukmjt1/71077918987.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf3292101---xavaxes.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f9e840a2---66784113988.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086916515cff---wogoxiweruwegatumefu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb53bf5d3---medukixedekexogatitojixo.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca25c20d8a---dikisasevevubobakivabe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e901a2929fc797bb35082e8207baecc9/bewobugolakusulabe.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798bd3cc929---51929041750.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c14e587271897272a0334589631faa53/52658588145.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/45d129b403dc7f1a61864c8e7dc57004/87214481419.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987bcb829bf---86190010001.pdf
    • http://thunderstar.cn/userfiles/file/20210505113004246149361.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160996d6a02f36---22651609675.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed99c2c78---45693439106.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/07ldd2ajga9390h6kb9pntquf7/dapazawibova.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77c0e7a2---54240699652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=online+marksheet+correction+agra+university
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4c.bin
c349aeca2f05fb8dd8beb22f33b53314c7c3033bc064cca72834fc63ee9684b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5464 bytes
font_01_sfnt_off0000efbb.bin
d95b6c2415a40c6b54d29d359491554bda7c87deaad74d4f09c995ef6faf8d11
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 11096 bytes