Malicious PDF — malware analysis report

Static analysis result for SHA-256 0134e790f5d7b250…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 23:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebcaf461e2d70355f1b60d0d0d6cd317 SHA-1: 13feaca2e2e19d93d0ad1ea1f001f0077aa43437 SHA-256: 0134e790f5d7b250c4fa9ae8ab090767074eb9093e3d4c2e73716d7d2b1efeba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. These elements suggest the file's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huucodatlanh.com/userfiles/file/nikutarujobikaxazisej.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/sizajuradazogezekosid.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210912045949.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139775b47250---77610496565.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/pudoduvelurogafod.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d70b7e1c---jukomosiveveja.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134865678f56---visufegitivaxusajag.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/40918803242.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/51235584224.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210911213544.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/kavabatudavumirujasebojot.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1048a8e6378cd994b7aed0da19056aa8/libexoba.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kogivukimurovixigevera.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/teriwevegaga.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guwoliru.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/parubafew.pdfIn PDF document text
    • http://agmapure.com/upload/files/xakupusivigaroseva.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xofijabewufek.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/26332447772.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/14650209846.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kurugif.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a368d309bb68ce4f129c67aaf9d669ae/62164004017.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/77304833382.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903055427.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/gaxupezewixolepila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=final+fantasy+tactics+war+of+the+lions+android+apkPDF 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_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 19484 bytes
SHA-256: bc3418460ea638041b87f6d0a1dad597eebdff48ace0be2489a82b45d89ecdc7
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10988 bytes
SHA-256: 3ccfca5103f22eb1702b3f0814faa0b0458e1382bf29a2647ed58e6cd98cfd24
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1