Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaa35901ae3e3d2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 22:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a88bd75ba39ac03b1f07a9a5ac3aab30 SHA-1: 93225ee3fd642f2b3e09b2bb8357ad2a7fdddd8c SHA-256: efaa35901ae3e3d29322c11b27ea61ccfad682cd7eebcf8255e75d95e1d3e603
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to further malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=mr+know+it+all+short+story
    • https://x-software.cz/data/file/gumujazunen.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/oe3tb95r1h3uhs16ipa2ead421/vaboneluwuvavufojoniraze.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/72211289474.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sevusimewapizosusamafidab.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca4c04d55---43316553895.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bikp2839eiicrp6j70e16mtf0k/29626000935.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/alpcr20qkql72rgls1tmeofjje/24737473693.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607697fc687a2---93210955974.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af0b6f9da---tolagexesifopiwatanuzobin.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dacfe750c---74382601836.pdf
    • https://dogathermalhotel.com/resimler/files/64594643173.pdf
    • http://wskinbody.com/data/boardData/files/46392191708.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/66734829973.pdf
    • http://birnagarcollege.in/userfiles/file/femolemazurasinigisiwes.pdf
    • http://www.aqsclimited.com/EditorImages/file/8151385152.pdf
    • http://shuswapladystriders.ca/userfiles/file/88081119093.pdf
    • http://technoculture.cz/admin/upload/file/fatopabimesebi.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d90be1d72a3a262e37093a1cdc10c55d/25154437520.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ec141bd8e2e83244307472aeefb62e9f/vaveluxokuxolavobozupemis.pdf
    • http://aaaexpressac.com/userfiles/file/83370974450.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/19fed183da26a28710c1ce5a8e4b7a4c/8444519410.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dc782b31---25099287757.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608316ff301d8---lefabu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ce0ba136---xiwidasopeguzilage.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12979a47a---kujoditowuzomege.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_off0000eeb1.bin
789d61ef78db3398cd27304d7127d01fdcc65cf64b33fca9d8002ef9b1e18dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10356 bytes
font_01_sfnt_off00010615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
font_02_sfnt_off00011e27.bin
ce6da9d0b834914c45bafa52e861c509eebf8072d511fb73d67998f2b4f9543e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16764 bytes