Malicious PDF — malware analysis report

Static analysis result for SHA-256 31112dfbc937fe62…

MALICIOUS

PDF

74.2 KB Created: 2021-09-26 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8e4dc25c7375492770b021c8cfab15c SHA-1: 08352edfb493424e5ec927fbf6788b9e1e0aa92a SHA-256: 31112dfbc937fe62a740e5bd8c26c6280c971af11ca4b523b7d0dc290c876bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload storage or disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://iberryhomemade.com/userfiles/files/ropogewupe.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141289345097---rijebadokuxuzakikivis.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jugelidasapikekawutetit.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/juvivovug.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/34925981668.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/pinerojenasuwutapelakatow.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/fatukuvuzarukiduratabu.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jekulat.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/jofagobu.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/29363424830.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2b60d82290ed10037c864b5ef240f3d7/kizarexodogijetusawu.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zobaxomolif.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/46996865601.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xatosasoba.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a330a70578d3fabbc996fdca8d07a33/buxot.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/15659370042.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/wuwowez.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fifoxezebuk.pdfIn PDF document text
    • https://labelmarket.pl/data/file/34597411679.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/rolitife.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/42916228670.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/90553110485.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c23ce42a3845f72575b5ef266894bace/14934948844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=episode+120+borutoPDF 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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 17940 bytes
SHA-256: 761cb31ab156d2922c947e3b03c31ad331dab6cae5e7de4c504050b5ffa2cc64
font_01_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 10592 bytes
SHA-256: dbe6b9c13d8306a47779d8e9f698365e88a83b10cf8fa8b4bf0eacf9c53c06f1
font_02_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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