Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfcfb28886ffea1…

MALICIOUS

PDF

69.6 KB Created: 2021-06-13 04:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2a2c46e9b16c0c1a93afc14706ef072 SHA-1: e4a4a477cf50e8c762c2085b620248296464add3 SHA-256: 7bfcfb28886ffea1129b2a1d0cab4e319a8579db1e410a9cffdd4daace817056
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. 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 URLs point towards an attempt to exploit users through deceptive 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://laborke.ru/uplcv?utm_term=santa+is+coming+lyrics
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404729809d---zegapijinugira.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bafa4aae6---fegifo.pdf
    • http://asupuro.com/user_data/image//file/79095861267.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b3v4uq758hhs1tr58ut8es3cio/73431356412.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ef1e7113---xavosofudipuxe.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1aaa9384a---fupofita.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/15e42e3e2ee26624552e42e057892703/batitekanedojijufagovo.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b05570123---wegawido.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4b57e63a---korifiwesesikavupanipidig.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4d1rr6seu6g5shvipkveao883/64365274423.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/38021593718.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67f2906---fepidefoxunosevok.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5b5c5318---66669425177.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66deb8a489---warof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d145.bin
ade86e03d2597740c3c118bd6c1a6c5b1fcfe20e438bd117353faae37a3dd7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 5324 bytes
font_01_sfnt_off0000e350.bin
36f1feb217b173a8c6b70fcef6bb445339d11a56854704ae9d7dab0abaa1fe4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 11204 bytes

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