Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ee58374cf6bab4…

MALICIOUS

PDF

88.6 KB Created: 2021-07-06 13:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acb0a7bc56965809f8b1867efa062921 SHA-1: 8b84543f01c6a21db1ccc4828f214269c06bd74e SHA-256: f8ee58374cf6bab4631ac7dc990c1b929044cae40c325d265eda7ec829cb1b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b2b0c3a6---zepifu.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c9be441c---fukubabor.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43215a1a2---92834401127.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/21560553813.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/62569659120.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/jururudelulaz.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850d3525bf4---mibikimusujuroxosetekab.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f4db5085---ruriwofaxovexowoteke.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/af3r19kajf4v5oa9cregghrlb7/powokupeget.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828310b8a46---tuniwidutomisejiv.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e635f9b0---gogenotevowufitiwogal.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/72189721532.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a525636de08---11687002754.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/99670417440.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210701_1F6D4CD84C136B63.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609732a19e5e2---67686185443.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/jozafutezolire.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609feffed04cc---wikosu.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kagisenito.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8c6d3d8---90415578377.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/refafurikafuzunare.pdfIn PDF document text
    • http://yuhongzg.com/d/files/95154726759.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca11ebf88f---makalazokujotozabewe.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/737fb0a8c0eca8f6fd3d2ddffbeb969e/dezuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=interring+ashes+in+a+cemeteryPDF 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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10576 bytes
SHA-256: 39c2b3ec83c006fc36b39e42c2f9bbb1738c404896c6f300d0c543980afe31a5
font_01_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 17216 bytes
SHA-256: 11c8d246da2674028dd2cf3a2cec5c32612fd1a76c24e035191576462f188307
font_02_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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