Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b81508196c50f…

MALICIOUS

PDF

99.8 KB Created: 2021-09-05 05:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aaa7b322d9166944626ae300087af483 SHA-1: fb8655845f1d20fb604d9ec67e4f8d823a2354b2 SHA-256: a94b81508196c50ffed5a6a2f5186e1397745af2211fcb18093d23c2c6e1f879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://verredistri.fr/xmedia/file/mapananop.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe96a9897---xibol.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/825b2ae1b4403e821eb0024501bbb64f/texaf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118c6a3813b3---47234990498.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/vudejemon.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/gusem.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/74783810377.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/20367821661.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/afde1bf458e3981646d6a7c3263dec0a/43673976836.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u9bqejg5vr9rt4l3tmrfb0qp80/bixosoxuror.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108c51bb8fe0---fonujaridonukalikuta.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e18071377---wirozuraw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/af4cf5ad2d10bfc438b79bd4e89d173d/moduril.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/90613320595.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/87582498753.pdfIn PDF document text
    • https://baongochoa.com/upload/file/rumunetanukonodaburez.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/86275884097.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/30989225873.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021731559553462.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/93617300375.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/sunarozeruviwemuxu.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/54484181238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=classification+of+fungi+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_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 10696 bytes
SHA-256: 1f987a9e6abccb5977c2e922af066df9c889f8d342e2a0c22ba38ffc1d203f70
font_01_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 17848 bytes
SHA-256: 7d3da11384b29b5c27ca6cb7e76f38eec131131b3952848215764e9eb882bd3c
font_02_sfnt_off0001698e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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