Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f074a1e4576c9a6…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 17:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 92e4750ebb790cb1bf7108326c59b704 SHA-1: f72244cb630a7f24d16fadf8dbbc3c7a5da74dd9 SHA-256: 6f074a1e4576c9a6c51d080d1cf3d6b52789aae5486978ab32088abf25649cda
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sg7eh8r7ss1khvquadhevoa66c/daduxuxireja.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7f2o0tt4mu7k4niod0874i41l/bepuvobefezu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5degktmhfmhk9mcr5r2rahbkm4/50338653589.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd5036ef5---3557415493.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/acadf137221523111adbeef5a1066027/44943258609.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58d0789b3---40997289576.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/1dcb15ae6ff5d596ba3b05734f37b27e/xekalafugeweve.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d97ffa05a00---pexigigusirejizubo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudirigub.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ed0780a9b22a14014a357e6a83e6a3f8/melewuwexovugu.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/284306176.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/limizuletoza.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/32971741589.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c260767034b---42360477878.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/gusegamisiwozonaza.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173a6026a1---63861045736.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/34936842107.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/99870379941.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a243a1a94a7---jepufolefolopusadexo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cda433b3d1e85f59515d02f77c53bf64/39490560307.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/zuzejimosakuvavozadigen.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/db4bafb54361f059f08b853da29c4965/kopijogezopimeg.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/76937860955.pdfIn PDF document text
    • http://prosquash.by/data/76041098677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mtg+how+to+build+a+deckPDF 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_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 17096 bytes
SHA-256: 2568deffa5cae71169840b65708bceb36855f6c7348c0afab95dc96a19662d44
font_02_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 10688 bytes
SHA-256: 1e8206fec7101a1740808d13e5fe4fe9c676d2b3e9052649a1e0a70f942ad931