Malicious PDF — malware analysis report

Static analysis result for SHA-256 850cbbc7a970b78f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-08 20:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 186b17782eeec014d38ecbefc51cf2ee SHA-1: 9c4a86fb9153895b40996512e75c31e2dada329f SHA-256: 850cbbc7a970b78ff262fbe43404d711cba42ebd40f43054084711cda1e3c2dc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eab04nhbun71ubkfg3s73rcujc/50586469313.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5babb1d6---xujapomeselofijotafowoma.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/968842906d80caad2a5c38ff7483ac1b/72730583003.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e83072575ed---jebujixebeluta.pdf
    • http://asremajazi.com/uploads/files/fisotijajibi.pdf
    • https://petek.biz/resimler/files/32483778868.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23012377c---90437240252.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/lepezenobebo.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca49be0fba---sajeku.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/2eu3v7vk61dn28g6kmlkh7jbp2/kigijufoteda.pdf
    • http://tortsurprise.ru/upload/redactor/files/pomufirusitutiv.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608760b1e3856---13794074734.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/71a5fc293898d433eff6acf5ed228c1a/80505877696.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abb136ddb---95755674550.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/oeqh1sar8i2h6jtp1st13ld452/xokoloma.pdf
    • http://cooleywestbrook.com/clients/865832/File/rivibazusu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/hb7th78kimrgb5cgv8atn5j97s/zikugobirinixatilogu.pdf
    • https://digitaldaya.com/imagenes/file/bubomedonuwemaxujiki.pdf
    • http://autodilykanka.cz/cmsimple/images/file/witejukuxusu.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e4e765a58ad0120f6d21f9c1d23adb62/68528072018.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b8108c5d---32470050724.pdf
    • https://grouptm2.com/contents//files/521530828.pdf
    • https://aldwalia.com/userfiles/files/titopuropot.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd09a6b6911---vimoxarunesedoxavimexe.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a411147af7c24c17a77939936f696a6b/redufunusupona.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5g5e2gjvj208n63vkfh5vhc731/2927219110.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ig+free+followers+apk+download
    • 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_off0000eeb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 16792 bytes
font_01_sfnt_off000106cb.bin
79dce59a158bc45706647aaf83a6f949f4157216e5a944e93699a15bfe0d019d
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 10612 bytes
font_02_sfnt_off00011f07.bin
3393d5c32fd32275195fc5c4bafd1787fe83b097b7f3848ec357cdbcca98c48d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 17412 bytes