Malicious PDF — malware analysis report

Static analysis result for SHA-256 107c6f786244ccc0…

MALICIOUS

PDF

79.3 KB Created: 2021-06-25 17:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f519903d91df59e44f997f77b4cfb5ec SHA-1: f5623ec8691587e138adec39ea12550221ac38c2 SHA-256: 107c6f786244ccc0ac9971788dcff5134580cf476f24e4fd18dd6d4bbed1ae3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. Heuristics indicate it's a link farm on compromised CMS uploads and uses disposable hosting. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160869d480cf45---92404484992.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/etr3o9j437s8kkooi7igh67jo0/65624350482.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210603_C2E2346EE5F27376.pdf
    • http://www.moyekolodin.com/files/zatagujetupudiliputugozig.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7de0ed77---pikot.pdf
    • https://ekransamara.ru/files/15251908917.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076757e63ca0---nilezukexede.pdf
    • http://pusancard.com/userData/board/file/56317664027.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5df4ba1625---pususikegepemejo.pdf
    • http://dichvu12h.net/userfiles/file/49676388264.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770faf015d---walalatedivaxanaxu.pdf
    • http://bannails.com/fckeditor_userfiles/file/wigowakelizukeriwebu.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa65d1606---mijufapewog.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785215b715b---17047205016.pdf
    • http://archerelectricsupply.com/userfiles/file/sofokelini.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608121e80baad---sanaguja.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/dorumunulolurilerategu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607950de13a88---66813054766.pdf
    • http://ahkjt.com/upfile/file/22177797059.pdf
    • http://thermcom.cz/userfiles/file/zuzuvavegadanokunep.pdf
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ec53fe8c---lemamutelolerobeboweg.pdf
    • http://travelport.pl/userfiles//file/dibirepogumef.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2752a147870faaee39d2cdb375e224f1/87679111226.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=types+of+investment+in+economics
    • 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_off0000d682.bin
9d9cd8b6f15c6c4fff65048f8281c15cdcd8a94374d99341f585be1aaee2c156
pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 10476 bytes
font_01_sfnt_off0000ee5a.bin
f6a0e3f7011a4fe7f853b295176075ebeebf5cf9e1d83221d57193805e0941e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 15660 bytes
font_02_sfnt_off00011678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes