Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b117269e2e1b71…

MALICIOUS

PDF

116.2 KB Created: 2021-09-02 23:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87208cd73a697f8d9f4c16cc7310e5ee SHA-1: a6260458e8b10c9360042fa9c3ad338d05feba23 SHA-256: d7b117269e2e1b7117818b1ec08cb5b1610b7979b503979f0be3c89711e0476c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://forepic.com/_UploadFile/Images/file/wagepeboxiparokinalopovaz.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/garavipasominasinulavo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1844f9740ca0a7f5af73610f57dca526/sedul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ff62a980---21268912794.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608613b769bc5---baxonolaj.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/90824330441.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3ia0p5rnvs4n7edsneukhjf79e/59326214300.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/15604027066.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jelunuxuwof.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/desizetasure.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126b427c425---79294422776.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/kuworudofanoxu.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/rivifubive.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/43026940220.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b5aa48578---77476500119.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/muwawigebomuwur.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/mobavoxulapenum.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/65664187447.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18348627889.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac11b226dd24ff9d46c88562ddd21d8/sagijilijetunijepijen.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c573049c83d5f48cbbe93dec2f5b3b6/darenogajumulosuvuxipi.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/48687156719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ideologia+de+genero+libro+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_off00015979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15979 10496 bytes
SHA-256: c7b953be3a7db99df31d9ef4969f1c27323eb5b6497c3685e24852b50db8721d
font_01_sfnt_off000170e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E5 22764 bytes
SHA-256: 00520461ac8454051eb4e0cc530e224a6d3a1662fe347a815d61099cbb1174ae
font_02_sfnt_off0001ab28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1