Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d926be4e01bb6e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 12:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd413cbaefbf143039724235fe8ad7ea SHA-1: 19f18be247df9cd7a37237b41571176336b8c664 SHA-256: b0d926be4e01bb6e9d94ee3d2b04bf52439eae4516bdcc6d41a457f2f017df95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=the+walking+dead+season+4+torrent
    • http://spiregene.com/image/files/20210913_122115.pdf
    • http://ensky-chemical.com/upload/files/31435636668.pdf
    • http://surestegc.org/documentos/file/povedepuja.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddad8d8610---81626421214.pdf
    • http://eakqshop.com/ckfinder/images_store/files/11715469419.pdf
    • http://kidsjeodo.com/images/files/valugamu.pdf
    • https://agrando.cz/files/file/26667057143.pdf
    • https://fitvital.hu/userfiles/files/loxasuxoda.pdf
    • http://abacusnancy.com/userfiles/file/74400818219.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/fejugovukewedonepuwa.pdf
    • http://eternaseguros.net/files/files/tuxikizoxo.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/63359064364.pdf
    • http://syarmarka.ru/userfiles/files/49372545508.pdf
    • http://teedinmaesai.com/user_img/file/xugexufojiniwasilutami.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2b5cd6c1b21e77565b2318595ccc19ed/1572196749.pdf
    • http://szentimresiklos.hu/upload/file/jeramodidibugeloronum.pdf
    • http://madmojo.com/fckupload/file/84085074381.pdf
    • http://asid.rw/userfiles/file/jadusiwaretinumuga.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/vitatulesibaxutadaker.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/60a08cbbbc1a3ab985de55bdfafa3c15/76756749047.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABE0 16792 bytes
font_01_sfnt_off0000c3f7.bin
8535282e3125b4b8f174b6da611773cf3572c998adfe1e447d8948e538044ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 10748 bytes
font_02_sfnt_off0000dc83.bin
a6662f502d3e2bfbf8b0c776d77dc930939070f9c59cdf3e16a21559e8c87b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 16380 bytes

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