Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8597903b593f85…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 22:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aad84d579648a825b68f3be0e9708397 SHA-1: 3186a2a08139c5db865c9e11a45b4797a5742248 SHA-256: 9e8597903b593f85fea6c40e0797ed4d6e5369e26e65496018f0e1fd3ec2625e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of the document's purpose as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baugeraeteverleih.de/benutzerdateien/faroz.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/31885573678.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aadb98981---47803226410.pdfIn PDF document text
    • https://stotex.rs/files/5930071048.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/gadejilajigotelim.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/linojoludulegab.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/lemadorawelero.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/runukosozatifuw.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nutufev.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/91384345808.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/fifopufijerezipesuw.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/33286499763.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109012006068079.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/toraxenujujisatifubafite.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7f72b2cef89e86930c0bc0d3c5cc2857/lowijilopabufotuxaxam.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/92809695190.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/36103422848.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/1598171133.pdfIn PDF document text
    • http://artepcb.com/upload/files/98431021688.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gamemutafisam.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/lijorinesukuboniriri.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/13314874786.pdfIn PDF document text
    • https://rintrans.com/files/48614471854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+3+graphics+mod+androidPDF 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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16052 bytes
SHA-256: 249ba24fee2c4ee7c066084ecc481a5a6cf65d77734df348ec609c79e39dea86
font_02_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10992 bytes
SHA-256: 013cf8329ee3038cdf1664789905967f69643ccbad18a4ae5ff49335bd2cc8a8

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