Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5345b4ca24e29a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 17:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b8b2f18cbe192a949ecbe6edb1e586ac SHA-1: 4ca12c1bdb91c8f0211d1bef283c567f52a15472 SHA-256: 3f5345b4ca24e29af02c3a404fa12e26e409083d41e5074b03a1ffdf8e37a099
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malicious content or phish users. The file's structure and numerous external links strongly suggest it's intended as a lure for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b42829512---51232290439.pdf In PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/gikijitesifubovoxipiwufux.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/232717c66d448874ea95a3bcc4a5da0a/98299217786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087507e47a88---59892478362.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/filenutesekuvikivaje.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108272126189680.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/83988431135.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115dc96ade97---pezaduzukimapuwo.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/ladovusu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/91222708469.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a09deab3b64---dipagodazuzixif.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/20941021671.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080675742675---10848959467.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/31d2d7897fc37b49617765f919da1398/zuxifijaveremerevajibise.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a392bc1bc77---83291403723.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/22151717425.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/91604073728.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/52305753961.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c95c83c58---fenitakidiloxajatesas.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/97377417965.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/tufuzibuduzato.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3638f25e---komasaxorafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=maha+ganapathi+runa+vimochana+stotram+in+telugu+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_off0000b922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB922 11224 bytes
SHA-256: b2ce351ad07358cb4e80f9f6ffcb332108fbce87f28da41bb5fefecc2a1ef352
font_01_sfnt_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 18856 bytes
SHA-256: 7c40eb047f10b009bc62307ad2958e7d421cc1a17bc2ffc12c6c842e5bd4f8fd
font_02_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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