Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ec83aca7f7e0f5…

MALICIOUS

PDF

99.2 KB Created: 2021-05-11 18:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f835f0c10af6ee7743421eb928565262 SHA-1: 21412d89e8762571389d9c8828fe327cced5eab3 SHA-256: a7ec83aca7f7e0f5abf11ad214bede4074a02a1e63d401019f409a61bc1500d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070329215906---jajijeso.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dp0nt869svaj4e6aan9pgdib4c/82600929904.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/abc459cddc4bcf1f6863cc1e5952815a/felisufub.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e0837f87fca7b6a541ca0ca090687d8c/saxozoxax.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9653fb07acb2354b0e03e741ffb39bc1/dugofinumovapebetumigib.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074db8843a68---rakubumika.pdf
    • http://acpiindia.com/userfiles/file/ramewupekogijepumot.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/536f3d4719f066f5a5e4b3732e7c3409/vetaviwemojaniwego.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a4c24ddd129b82b5c7e32568858cbad/kadadeg.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/55l0nlik4fhpso2jo4ggccc3d5/jijisitituxore.pdf
    • http://arohitourandtravels.com/userfiles/file/83296811827.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a68667aae---nukiputijubepadasurozuxu.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5o1nmjd60199lup4cccdon7ebr/povovetusaxedifumi.pdf
    • http://angelcabrera.com/FCKfiles/file/87854674071.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d5mf1m8vld9ajpqd2r5s6cqdeg/39981634555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hearts+of+iron+2+deutschland+guide
    • 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_off0001459f.bin
90114646bce95f938a9e833446811e8986312ee392bba71aa444396e2a061c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1459F 5376 bytes
font_01_sfnt_off000157e5.bin
0b118ab7f1915eb58d155d90058d795ff4d55ec958a833a75c6f9bc2e363540f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157E5 11996 bytes

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