Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e9be6c74ab774…

MALICIOUS

PDF

78.1 KB Created: 2021-08-11 08:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d075a40514b26d6ff60dbdc9b8af7820 SHA-1: 68757aa0233d17199507c79f1789815024a9cfee SHA-256: 857e9be6c74ab774eee02a61fe090ec05b8fec17763fc78fe6ae1f6b19bd745c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, as indicated by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term' parameters. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=how+to+cheat+money+in+pixel+car+racer
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0b74e8f435fc469bc7363796e6e6ecb9/zebige.pdf
    • http://bannails.com/fckeditor_userfiles/file/17621185335.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0e8686a9---35069930924.pdf
    • http://janandpoos.com/clients/872640/File/10361777729.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/14083423015.pdf
    • http://jedwines.com/cmsCart//upload/file/83983370416.pdf
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/97160415254.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/614c9e9c1034cf29ca842b495e737e33/84767603280.pdf
    • http://dienmaythanglong.org/uploads/files/55923689830.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fe3924dad0731cb1f3cfa936e67f6ed/bigivavokiretabafed.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d898e1d1f10---4877848196.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c400777ea03---9914553822.pdf
    • http://silesiacapital.eu/data/file/36697777096.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c174ce49c4a---seluxogilofapomapenutem.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/46a60951136dd1ad1aa8eb428916d914/noxaxogexiresiruv.pdf
    • http://wami.cc/data/files/rokuturutojujunofaris.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/13de586ece6c0bdf33da2bef7d419e5f/borirofiwejozir.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a3803763---rogekotegujel.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kfsmttkuf5fu861ut3op3dlvpn/velobaresefijozigo.pdf
    • http://kubkao-kubpla.com/userfiles/files/wodogarezezobor.pdf
    • https://marljivo.hr/UserFiles/files/66000228209.pdf
    • http://coffee33.ru/archive/file/91551874233.pdf
    • https://festival.bg/fckeditorfiles/file/23943074953.pdf
    • http://fouladsazanco.com/Upload/file/megiwufasuveg.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a5f9e5166d39c12b65f78b705947e3c8/xovusonigoni.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_off0000cf1a.bin
a6dfe207a302b3bb498a307e60ea871e406559c63a2f1d5cf3d666d658782874
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 16628 bytes
font_01_sfnt_off0000f9f7.bin
92a66db52162548a880683cb72b1bffa8af30efaab524807710f922a5550f3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 10764 bytes
font_02_sfnt_off00011289.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16792 bytes