Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e9e61321aa3880…

MALICIOUS

PDF

112.5 KB Created: 2021-08-21 14:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dae9772b763df0e5d3eb7a4ea141615 SHA-1: 6c6d9afdc285681c499f7e23925756b1d4fe01ee SHA-256: f7e9e61321aa38800b58d23eb16a47df19d80a71442861137b3d305ed1f25a3c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=prefixes+and+suffixes+exercises+with+answers PDF link annotation
    • https://mama-light.net/business_school/uploads/file/35946197819.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zesotamutat.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/81652941279.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/18555923678.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/tcrparo9fl2j0r2rb9vbeesr91/lutilejogepisipapanovos.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/jizubiwabusad.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2da816bb35---19647042476.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/59146296937.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9af135dd97cef81cc56a2a13c6017d8c/bamapelivadoporowefav.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e390cfb4b---goxere.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c6b8248ad---49097030147.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/43635314477.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/forizu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/4e5a7d040702f14f2bcfbf738ce839f1/558653851.pdfIn PDF document text
    • https://tipresentoio.it/images/file/jeboj.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/79015452058.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/36193147514.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nikugezirelimirebe.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/79445717550.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kawewiwuwasujafafimelifaf.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/munidotomixurelimifu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/62b98c26c8b76cf195a3ae45f51179fb/87190071508.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_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 10696 bytes
SHA-256: a89ef80b4a9e700e701a2fb0ee22b861bc6eb20f6e146ae1e24cbd4f3eaf9076
font_01_sfnt_off00016b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001838a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838A 18072 bytes
SHA-256: 79f490702eaf95c261ad71e740b458797bf4f7ff8587838d2ca14f2dd4c0d21f

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