Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a50c4a193484a3…

MALICIOUS

PDF

91.9 KB Created: 2021-07-25 21:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 110cbc8df71085b7aaf53b0b851c441c SHA-1: 0c5f4a00830db1521bc30fa2e1fb7f8b7ffdd1d8 SHA-256: 67a50c4a193484a3a2d6ec1119fe2cf7dd018a39b31c932d4c2b7c2e534bcac7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous links to compromised WordPress sites, a pattern indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the intent is to trick users into believing there are new payment instructions, a common tactic in business email compromise scams. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence point towards a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dec5fcc3---wixozepokokufoduzewovunuz.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983278475f1---78787531965.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/33268405532.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/12494686926.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/bajijasupagigimu.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021072403575473499.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/gudavejezakojudajexo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab1b31a2a---tojegizijosufo.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/79973917465.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/69210376258.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a853d161a9b---34104781287.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/51629656285.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/b0md070n0phb2eavrah6vnj65k/43849814392.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/58315506662.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/43690164619.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/91d0sf98rf8f161bp7mstcmhkd/78544162239.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130f39550---67490518012.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc4d209ae---85534938900.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wupasevu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/67101012347.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b7elicdkre8eetn11uuk31fjj3/fubalikonax.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0n9rnl095u4kudncmscp6alvn1/62435148388.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/15893370916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=t+mobile+online+bill+statementPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 17124 bytes
SHA-256: e9ba3af3b05152001828d88afb9b832eeda08d5bc3a170feaf2a8b18c02ea5c7
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 17024 bytes
SHA-256: a73c6cc8324d355a8fbf090bbbe51eebf422f19f129376178b919e4036320c31
font_02_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 10272 bytes
SHA-256: 179e84ff44661508acf7f2992be5714f7700e8ac727309ae634c534dd52f0f2f

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