Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2752e2834569a7…

MALICIOUS

PDF

75.6 KB Created: 2021-05-10 10:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a957cba81443472a206d2b530dac65b SHA-1: 03e0164ff0eea850ac27242a2fe57d629a63c05c SHA-256: 6a2752e2834569a71f34cc1d8ae244206008ce051a489f3e0a1ca6d3b93d64f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely related to phishing for software cracks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/27036379bfc3c8aa641e73bd57a103db/64023691772.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160800b1e0edf7---viranejumugoxuwipo.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2k2aot4dioc7i6sjv18aatet2/90690520345.pdf
    • http://africa-emergence2019.com/userfiles/file/datigurubokevaku.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//31789219338.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f14f9308d0990f80011c066f64d4a1d7/kumafezijapidurut.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/be07559fc5fb8b36e3efa57775c0a537/jukefisedabejasotipis.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01523b154---36085202521.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16079089448b31---dakosasifipe.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d85382286---57428379556.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087805fa74c9---32683243962.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38ab4ab62b513824b6e465196a567415/50695244231.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free++autocad+2010+with+crack+program
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ca.bin
75efba934f976c194d3c3038150c1aa9471880b7bee3db505d08afb77342ccbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 5488 bytes
font_01_sfnt_off0000e493.bin
814a282776cea1180e74d52011e203fddde174ee935db87ab7da9476ecb3f97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 18196 bytes
font_02_sfnt_off000111dd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 4324 bytes

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