Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e518adc5b2035e5…

MALICIOUS

PDF

113.4 KB Created: 2021-06-01 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3868cd6c9114f8302575a2bb90f3791 SHA-1: 5fed5e562cc966ecc05950412be8e8609ee7add4 SHA-256: 1e518adc5b2035e507358e3f9b6d76dea64101b2515fdee4ee594debb39ed298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The document's apparent purpose is to trick users into visiting these compromised sites.

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81150873ee---kuguwafige.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3273e8c4ad480053e0af3ae3291f3587/reboxu.pdfIn PDF document text
    • http://goref.ru/files/file/libunagibawumovurudojubol.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/19172229714.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082cac9d8f96---fezikunoribowapi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f280e2cf1---zuwuwifukozaf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/s29p4147tfpvfnpmes4thl2lam/dojun.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5d4d9bfb7bcb4af47a2bc139a0e630b0/bodubiwaxisipoj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949557a27a8---4265227676.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/jutunowebovig.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089595bc2165---86870281794.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda89dfaf0---10410117290.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/10901795418.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071956eaafe4---12205173001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=books+never+written+answer+key+page+127PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A68 5588 bytes
SHA-256: 7c028373d93ad470ce71bf6812aa77d89bf00a46d9ee582a9e55b75e1364d5d8
font_01_sfnt_off00018daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DAF 13528 bytes
SHA-256: b6be26d8d78579e5b9aefc3ea26d92b53cc6df6166b1ea53adc2efa3171ebd58

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