Malicious PDF — malware analysis report

Static analysis result for SHA-256 190fa69f67411cea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 23:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b610ddd48f589e3d399e4ade29f94b29 SHA-1: 674bd9973bf365d9454990d013444879d3376cc6 SHA-256: 190fa69f67411ceaea96ec06005cd4ced4f31c2d1ce814fc40d3b80babaabbd2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://twr1115.net/files/fckeditor/file/58640334543.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598eb8aed6---69373031643.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16108a92ed229e---39879862871.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/75707469814.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/kokububasutudupa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b12460096d---46678830613.pdf
    • http://impressivetravelvietnam.com/upload/files/nexerepinelos.pdf
    • https://businesslife.com/content/file/98845079233.pdf
    • http://caraudioshop.ro/mm/file/32013784205.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/94601507d2dc3e03a5a252ee5abb4ead/kuwopezowaxefuzus.pdf
    • http://driver-jazda.pl/upload/file/nezigidenagina.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/36938678323.pdf
    • http://vizit-k.net/uploads/editor/files/dupanolewemixejaxemoxo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c161f9092d7---rurologel.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/897ba974c80d3f1a25b9f2956e9cd8d8/tolizopobidusu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hamnfe5sq2rcbecl81qf11gb02/34611586405.pdf
    • https://pet-fashion.ro/mm/file/mavixuxalof.pdf
    • https://zivotzaokny.eu/res/file/14408652436.pdf
    • http://koryosushi.com/uploads/files/99468077074.pdf
    • http://liddellgaryfamily.com/clients/863293/File/webegibosul.pdf
    • https://bleikss.com/userfiles/file/41725133332.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/sezonadugapudokodunapod.pdf
    • http://agisinfo.ru/uploads/content/files/22485703715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rig+vedic+period+pdf
    • 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_off0000d36d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 16792 bytes
font_01_sfnt_off0000eb7f.bin
80d03f542692ef7224ac1ad62722918fb0bf38f4d2a8f18d4e4c9e939c2b6d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 18236 bytes
font_02_sfnt_off00011b6b.bin
033ce478d5cf25c249db381d25cbe52f782fe8e5863777b0534ea95baac9f2ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 10328 bytes