Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3f9a15d7a760b5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 17:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffa76dea606dba40a4a1ec2b47b0d1fc SHA-1: e5510474de692ced65eb38906e44f0cbcd0a8097 SHA-256: ec3f9a15d7a760b5fd83529d54bb4300a7c17310d81860a45b7d577b9995fbaa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is largely unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jokilaaksonratsastajat.fi/file/96948941295.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1d8ad3661e6168f55ad4086722fbb6e4/54346619607.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/dutulufatobejavesipumu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9114ad92e5bf86e70ebe6b8aaff0bd2c/gutevidalifukomipot.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josonolekixava.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/tasivutid.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/8545759290.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/45150238412.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/momugowu.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/79143907507.pdfIn PDF document text
    • http://polipack.ru/content/file/jowub.pdfIn PDF document text
    • https://goodline.by/userfiles/file/15900840119.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1d4b0e40bf881cd15cecb87a82561db9/xofolomigo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6ed1cb73---25826869258.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f692e86---gerufexijoduluze.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/47677574489.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/suwewazofulane.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/66115488548.pdfIn PDF document text
    • https://migger.dk/userimages/file/26559031634.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4ca0f9667eab353fa7520556f7bd1aab/vapovojizopividago.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/78238824351.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/wuwutole.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906044357.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/fijekoxobitabuxefadalexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tonsillectomy+and+adenoidsPDF 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 17932 bytes
SHA-256: 503661c96a724bf7673c4a8c798275d38600a48ba206f81bf8eceee27e2c07a4
font_01_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 10508 bytes
SHA-256: ea3adf0d08fcf7a118c14f7f46f975000ca41745a45cee5b12e93b832a809ac0

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