Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a7c56113a19ded…

MALICIOUS

PDF

99.7 KB Created: 2021-09-06 06:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f203312b69c7d7691e303c738a96106 SHA-1: 5afacd5256db5a508996a2244fa0d364f070bf2b SHA-256: 55a7c56113a19dedbd06337159a586be39b3d5de1c3216ecca330939c4628a9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=anorganick%C3%A1+chemie+housecroft+pdf PDF link annotation
    • https://ahha.az/userfiles/file/pivuxebimitijizejure.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/10155450434.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/62545673872.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab7e34773233b198f6cb4826ca0c8d37/87594118641.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/67bddd722fdb72054a30c55dc2e70038/44662027479.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/93327152956.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/titemonazanoto.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/veliwul.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/muwepesuxuwofufedipovipun.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eb8e798e589c1bafc6f19b3503a5192f/20529753354.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f94a456e54---4438887175.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/da6b6165320658a3722ca0762015d3a8/poxesozejapofu.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/dewigijufomalefopisemu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a8c2ec62---20520162116.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11d347ceb---25203647215.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/6022290688.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/vajuzenuxesolet.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a749e29f43d---29774586479.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5de45e44---bonavire.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082642861ffe---83031809417.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/mejafutis.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/sowivekozurafala.pdfIn PDF document text
    • http://charontrade.hu/data/file/fagazudemomumusegarat.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e17777e1---giwububafimulokemekur.pdfIn PDF document text
    • 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_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 23176 bytes
SHA-256: 06cd5b85c76a5bae51653b41ecdc1e54948a96cb03b5c12d80f0f8970f283f27
font_01_sfnt_off00014cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D8 11372 bytes
SHA-256: f25093165ca658cacb18fffff9f4ae56ec3cdbe92bdf99fa4591de54a1f6fa4c

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