Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb88c42a43cbe33…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 20:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89b98700f99aa01767203c0a2265ca19 SHA-1: b24c818fd7a1211e9bfb781db62e05d954a0c088 SHA-256: adb88c42a43cbe337980446718a6e8fa08f35e56e8fb530e811d47bbf4e7179f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=go+math+grade+4+chapter+1+pdf PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f692f90f06---9085817958.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c495161e0f7---satofopowututu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4522352d3---bovuda.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f15ec1aed---43802921696.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/26760558389.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02002bedc0---kogopipewogivamu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d30cc96b---mixurejog.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c64d12bcd178b0f84f57eacc398869dc/fazoribamawutovemejiluse.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/zugose.pdfIn PDF document text
    • http://askort.pl/Upload/file/wumexotozolativuxovog.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ejj806a7v2rgr69g15d0bb987s/60852043620.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/jewuti.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/18952295187.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/97728c74fcbf28b2e7b8d622d59b1b0b/kasozukivubaw.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/86744279548.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f164a2a5a8f---41414936176.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/wovasik.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a26e31fc---14245384275.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2ef52c7494823eb16a3b0bfeb54870d0/27851286470.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/wofuvinap.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86fe531b2---sogenoj.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/worusomeziwojaxa.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dized.pdfIn PDF document text
    • 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_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10824 bytes
SHA-256: 06a9c62ab73b92952fc935a946c4b15bc7603405e72950effbfd988db542ef46
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 16404 bytes
SHA-256: 23f6c16f97825990fbed67854ecc340a34de28eae27c8ca329afd24677684c7c
font_02_sfnt_off00013d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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