Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129267f925eebee…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 20:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0247fc63dbf652bb86b2befbe470245a SHA-1: 351634d2ada22f0d957fa68c1fe6d8ec9112c071 SHA-256: 8129267f925eebeeceada390f0f9b22d467f67b762ffe744e967da1f1648fc93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, designed to redirect users to other sites. The presence of embedded URLs and the PDF structure suggest it's part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.srijonihealinghome.com/fckimages/file/vepedubavapijevipesu.pdf In PDF document text
    • https://soudurelausiere.ca/upload/editor/file/3285687216.pdfIn PDF document text
    • https://wita.lt/images/files/bezutitup.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/sogegigivubujuxo.pdfIn PDF document text
    • http://japhina.com/upload/file/jupimeguwoxuzu.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/42165863414.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/24193730357.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/toxizoleneluzakobozomojup.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/vegijijona.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xitor.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797102e20d9---31525933791.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/98041523925.pdfIn PDF document text
    • http://1carl.com/userfiles/file/68118602774.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/riposuwaxiponafowuku.pdfIn PDF document text
    • https://afayl.com/userfiles/file/safuvab.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/43915619126.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/87734061354.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160835f23b68cf---74694963895.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/kezovozunuvetilo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33dda4fc6---zagafedo.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zokefojok.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13d04961e0ca24b762bb45088ac29524/goziveximaruxirasuwu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/12246404023.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/680ce66fe50e864173fd03c269c9a983/lopigotokitimivaxugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=profit+maximization+journal+pdfPDF 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_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10752 bytes
SHA-256: 0a4d6c2d8984fb2f6fc3eb49a423d901fd90665a1fa7e9cac67c0feb95b7d47f
font_02_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 17524 bytes
SHA-256: 2fb5ecb7bee43c467856b61f67a345d2267df0b1b3b2b0eb2aa9d9fa71da9a22

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