Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6cecc5f56ae363…

MALICIOUS

PDF

106.2 KB Created: 2021-07-01 09:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4293ebdccc1b04a7276ab1f7dc73b0c6 SHA-1: 18edade4079425f73e7b487ec17645c6cd5ad753 SHA-256: 2f6cecc5f56ae36334422b75dd2eba55f33ccf93b364528cb0d3e693bb055129
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/856034907e872208c291f6a0a784fc13/69661874633.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc55c825c---40908076990.pdf
    • http://normel.org/files/upload/file/18018778920.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1cg9a9eugungtdrch7t6n12e17/56811863392.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qp7t2g4n3a03a7jgfvdhm36sp5/44473783132.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qqhdb9n71c81j7cfhd5ip4f2s8/34401415573.pdf
    • https://otoform.com/upload/ckfinder/files/29682784262.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/kiwabomidufurala.pdf
    • https://peilimineko.com/userfiles/file/togovuxoxowizu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b8a96f43---48799962831.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/782fae95be69ee99181ca9ca670a15ef/diwasevi.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6s4cfsogh9ano0snl1j9pr8kjv/padumedoloxat.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/70995008625.pdf
    • http://ldbell1965.net/clients/85689/File/37509502571.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6b61651508ab0df09d870d3299762b61/fezekamisidibetupufenajel.pdf
    • http://kulturazebrak.cz/userfiles/janomibumipad.pdf
    • http://aa-nusd.jp/18266917523.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2440f0f2e5---47820389259.pdf
    • https://chezgregoire.fr/userfiles/dawixorimajeguvulu.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jewuxurepalejova.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5ad628c7---lugavikafobotag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=human+resource+management+system+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_off00013daa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16792 bytes
font_01_sfnt_off000155bc.bin
10c692e692b167f1b36dbc3f986b7acaf0e1766df6f144708f44ab8aed23ce71
pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 17252 bytes
font_02_sfnt_off00018239.bin
c166a9ea300e5fa5d3ef360eadefb49baaebc70bb455227967044ffde4c6e153
pdf-font-stream PDF embedded font (sfnt) at offset 0x18239 11032 bytes