Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0885eec9dbe4273…

MALICIOUS

PDF

89.4 KB Created: 2021-07-22 14:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5faccb94be7b2d83b73aba770fb7fc7 SHA-1: 9831af9117f5d4e66f6db994738617c32b3199ce SHA-256: e0885eec9dbe42737e08b66f00bfc95beec6bb5bf84bebe687b951313ee24fe5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f1bbc64127364c4db3990ef7e1057021/69967090557.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f35d8967---gonosakowise.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/31e3571c4be2bbfa2ae8a4d00ead81c4/82628812912.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073101e48662---36721789888.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/85275123502.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/dijegexuzufinu.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/zoxas.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/21607506161.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/vixabofibu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ffc4d66f922d96d8a9f0215aff1f9341/jakenadebibatol.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1g3e05a0fbf7oui7thhb293vi2/mulenebeni.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/25086113713.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/zabefa.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/botoboliwuwituza.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d6f1b1294389b12de9725aadeb8d63cf/18612028197.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8baed709---77819269434.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a78b9c2d087333f95144bece0c7ea5e2/momajikerafomisazutupa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074709f15ac9---29022086242.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/109d1feda900b4c7ea1ee93c79432ea2/xavosofiwavifapowupem.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/94820967619.pdfIn PDF document text
    • http://ccshecea.org/upload/files/safap.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/97281130898.pdfIn PDF document text
    • http://foodchemsino.com/d/files/lamuzesalepumupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=encyclopedia+of+structural+health+monitoring+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 17188 bytes
SHA-256: 54a432a3d235904383c7b621254d59dd1f7b7bc239aead419e512e8d12fb7984
font_01_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 11264 bytes
SHA-256: 142a005c7f4049be2ea9b948a31d679de557c817a71e16483605ed49bee61cb4
font_02_sfnt_off00013f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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