Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7e403dc1b91c90…

MALICIOUS

PDF

68.1 KB Created: 2021-05-01 08:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6013e819fd409c53551592d401391f64 SHA-1: 83baee137fdd0733fc6c6ca96e8b03f43b90c6f9 SHA-256: be7e403dc1b91c90fb29da357a0d37960a8989b54e0489d8ebc61c193387201d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to exploit users through social engineering or by serving a secondary payload.

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k7dc0sq8tblvkp76vnfqu635gs/sunawudi.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f127e055fd---vufaz.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9541d616a849ac3650ba07b226eaa30c/kimoregi.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088560570e13---faxakomiguvutapik.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/57978477ce313a1e8b0191e4d29e6da4/62452611915.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kpuer08k4gv58fo2fpauuuan0b/vuzagewezilawo.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/05a79e3dc52a7d17c11d74130132a8fe/13676391431.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vjkksua8n3cb44pcftn72jscq6/fumubikifijezixuturikikem.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/769b3a3a821215d79b19ee1f9a8eec6e/xikafagenotuzug.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rgahjp8vhb10dfjvqb7p0h8ot3/zevuborewovibit.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18abdbb88---19561385100.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde1265df4---22643775768.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/78bc316c306ab549ed9c3949d0118868/38528541095.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/563576f45e5cf7758422b8edc87c78a1/zukuxugul.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d92bfc37f0f2784763a0ef06a09f4d7d/98955906095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=thinking+animated+gif
    • 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_off0000cf56.bin
6eb9ecf83ba822ab457538b264c1ff979f6d8a8f8d9f20974fd9b958286b92e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 5028 bytes
font_01_sfnt_off0000e051.bin
9affa30ba41dfe2734057b2def98724d1a4a988f66080c48f054ca648729e345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10328 bytes

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