Malicious PDF — malware analysis report

Static analysis result for SHA-256 3537d9a982859f49…

MALICIOUS

PDF

73.5 KB Created: 2021-05-30 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bfd72b78a276ce0147adedc217f148b SHA-1: a8903f70be3a597be4a2ce52d1bfea5805a2e89d SHA-256: 3537d9a982859f497665788490f3c795d6d6fe5b2448bdde59cf6bde5cf0a6bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect users to malicious 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://irlanc.ru/uplcv?utm_term=troy+bilt+pony+oil+change
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e1e12653---kajejakuruwut.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/icod4bbnmujko8i5sejl53nh40/5569417071.pdf
    • https://advance-pack.com/editor_upload/file/38173333900.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/266f90cd8f60b94d1f135673047398ff/reput.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4db7a5971f8bd75cf1a154648dc42919/woduditudetajewokubuges.pdf
    • http://fygl.net/uploads/file/190943385430.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3e208264639ce8d1007110a709c9e132/ravadifif.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/43c2ef6af8b5ff0c2c3099b7fa502eb0/51969504707.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5lkgchetvhtmh0cc8taiv2s9f9/7088503300.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3964c20430b0af72bf7a86b2238477c2/purerofimixodesim.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1jb0erim7hq1iic8n1lp4rdnfj/fubukibutufovokunaf.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b739a56a---nurivofusinikalexewofu.pdf
    • http://ahxxzx.com/userfiles/202105/file/79229339419.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/be4a96cee018a436f2a53e4935bab0e4/93514754967.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u70o81e15unqc1tdu50ckvab33/kimipame.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160791b3ec21a6---91621531027.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_off0000e4ec.bin
bfd615ce5b2d9e2082870f1c2c0c5d7629afe9bb4b6a71774d87916f4abdf27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 5208 bytes
font_01_sfnt_off0000f6a7.bin
cd97d30c08dbb1bc4bbde54f993a4d1bb01f139fde949e1d4292b2bb8fce094c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10296 bytes

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