Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2c98f4b54646b…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 10:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f82f6b0801e502b5cef5a61ca21de3d SHA-1: 7508cfc86ab8c7aa44dec901a1eeabeb52751432 SHA-256: 3af2c98f4b54646b8c440a15adf4f18752e7138a6c927f1b56aecb8c82a5edd2
156 Risk Score

Malware Insights

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

The PDF contains numerous 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, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the links. No scripts were extracted, and the document body was unreadable, but the link structure is sufficient for a high-confidence assessment.

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 http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/35ce07be538d84fc8791f7ad72c7a6ab/1131859573.pdf In PDF document text
    • http://studiotecniconuti.it/userfiles/files/55049142213.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210702_D94C02BE984C6548.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/084749271c7673ff7647e2c19b833e1e/72412413723.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161044548135b0---pobaken.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/i9m6pnlmhkk98affaol2djd5n0/53547425058.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lofaf.pdfIn PDF document text
    • http://henca.com/files/details/file/gisenibomaluxodubu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62423cab1e---jezubowepisuxusekag.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/dusagosapezabaxawopakuvin.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/90845320970.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/939b3fe62e131e6907e67dcf7441e159/99430091194.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/45c700knn2g97idqh606nfga18/1941326244.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xugifod.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/powovuwobavudizotinatowul.pdfIn PDF document text
    • http://matfreklam.com/calisma2/files/uploads/jukatavujodazuxar.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608739563a003---90991992099.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/makufawemitixezoluxot.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/32922056263.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf238c39cd---90685139307.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbbe23da1---35536195455.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8617349f1869ff5515c68b3bb290aaba/pifotuneduw.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/medifupapozodometi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/16689336123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+resueltos+de+transferencia+de+calor+en+paredes+planasPDF 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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 17792 bytes
SHA-256: 7d17bb9632cd1f8446ac2bb3457af0b628adeae38920c9ec77b9640cba465d0a
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 10828 bytes
SHA-256: a8f0069099ba45619639b7015220488ea655fcc2a8eff8b315ca5c605c576e97

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