Malicious PDF — malware analysis report

Static analysis result for SHA-256 595fc3ba3c1ce256…

MALICIOUS

PDF

92.7 KB Created: 2021-09-20 12:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a15edc7a0f3cd63baddc8ba777103c0d SHA-1: fa781d640349ace448f63a7b844b677ecb90e0eb SHA-256: 595fc3ba3c1ce25654dc072cc7aeb202076298bb3905987188335f15b1a274be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://imcborivali.org/userfiles/file/pejinatosefapipax.pdf In PDF document text
    • https://radiosmile.hu/upload/file/sajebogumebab.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/52767061879.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/55737620175.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/32481534396.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2b76f55---kitokazudelotikukivevim.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161474c413b8f2---3366743411.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/98035207177.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nidijawonuzemum.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bd866b720690ed52196a17e79e44615b/16660343897.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/81284193044.pdfIn PDF document text
    • http://fivelscope.net/fckimages/32369380059.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/85643255976.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/73403439623.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6b42e7177482817a99caddee997e3e1d/xogusadogovi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a0b0aed156fa9f4dd0015264e30a1dd9/72793299149.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/visuzav.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/tamigetominufaresapaz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/001adc07bdb1f93710da5ace21ff7bfc/wamanakaroxa.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/44rnf7s9c2lhvqp4kfuhl1cqg5/muraxijosixodomojari.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/gozibof.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5212361d2---gulijizizamikamatitosevaj.pdfIn PDF document text
    • http://thefencedocumentary.ca/adminfiles/file/ludek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=enemy+strike+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 16204 bytes
SHA-256: c22e55149c85bc86a1323027fb7e6ccea7b7f613c8052f9a9db4aa1b968bf110
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_02_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 22564 bytes
SHA-256: 8444b2a334d09be40dae7b38c8c6ab0fb5bf0e468afef796c52d276b983ef475
font_03_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 10696 bytes
SHA-256: ff7dded0caed8ad3c335f4061973b73beb94aff36e614300cfb72881984f8014
font_04_sfnt_off00014c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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