Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64abf2cb889031…

MALICIOUS

PDF

92.9 KB Created: 2021-08-14 11:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f533aa84408a7d8e7f7b0d26737b63a8 SHA-1: 229710bbb7a9f47df8f62f05aeab31d8fbd10d9a SHA-256: 5c64abf2cb889031ed10659b2831783df1be328a0b4b6e4b24973dab793ca4a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e55059cf5d78d0b50af7b5ca4c5b84fd/depadozukubename.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0844aef8---tutipunilujepimot.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/58962607032.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/noxowigikasunano.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160faf04251462---32588758092.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/safusipekelugizumomovadan.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/47241757759.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/bivezowi.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/21092658890.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abce789fc---45385039672.pdfIn PDF document text
    • http://shesob.com/file/files/42199904049.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/37009251792.pdfIn PDF document text
    • http://ipllaser.in/uploads/19180472396.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ca1efd4c26409213b13e1f66b4a9a289/gusirijikaxa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf4953ec1---winowoxilesubabonu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/22296582181.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885528d1dd7---21402215464.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/79086977413.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608004979b628---xufonidumaweze.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52ed0a6f12f6947fa7e40b2777c1c734/43845342273.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160942e2046fc1---putopopazorexovuguma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+soclean+2+with+resmedPDF 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_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 17760 bytes
SHA-256: f1c07eab47e632ad8a274e17fe72f8c7f99b37a80f924dfd8928eff01314f6c9
font_01_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10932 bytes
SHA-256: ad9740807ad6a7f212f12dbab387f61276602a8d0df0f8d1976f8b8fb69ca0f3
font_02_sfnt_off00014e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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