Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f6921a59941b65…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 21:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee97919841f66cc1b54b197d60206bb5 SHA-1: d7d94ce10613c65d2af3a9fbb01e09a06b225f82 SHA-256: b1f6921a59941b651495ee31adab81b12ce975c0eb426e925d3a00575533e66a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hebammenglueck.de/ckfinder/userfiles/files/tedujal.pdf In PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/23890618932.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/27259008477.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/76052851364.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/741bc32a6c712adcb7ad967b471db245/93018583996.pdfIn PDF document text
    • http://htygroup.com/upload/files/lawawinulitipemibonupoti.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/gavigarul.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/99301550993.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/67240078404.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/87511138601.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bc349e31---19937945895.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/tugitiruvuwobedizi.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/12474491161.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/81901840346.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/bofezoxubediwakivi.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7619324295.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/73693706412.pdfIn PDF document text
    • https://hotelcorona.ro/files/7291450982.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/medusa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2esgh2s4sjr9rkhcvkr1uoi10c/nuzupob.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/30315753016.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/21156704504.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/lowovibopafesilexa.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907005528170697.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/xibel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=atlas+of+human+anatomy+for+the+artist+by+stephen+rogers+peck+pdfPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/kuxovubopatitewoxizofujel.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_off0000c3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16664 bytes
SHA-256: f2f226785bb59ea564af30ac1f294ef5dca71709d7925f6cdde880778b8228d0
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 11492 bytes
SHA-256: c8f25ead65ba6614d2cc843a570febaf82ed5b4d1ea557f1126cd3e8a2eea6b8

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