Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56be15f84a7e704…

MALICIOUS

PDF

90.7 KB Created: 2021-08-25 05:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0a9ec11646e1bd894147c860651b104 SHA-1: aa964747a8dc1eac591664da098922d68b0aa7f1 SHA-256: d56be15f84a7e7044fea14eefac69bcd7714df9e9195b43a7e88fea9a7cbc48e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://rdw-wolf.de/backend/ckfinder/userfiles/files/49329218403.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/jobitapemupaxeduwuwareri.pdf
    • http://becskeicsodajo.hu/admin/fck_upload/file/4323367109.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff5537521---20638354982.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a522895d80---xusepebijewobat.pdf
    • http://ttmplus.com/userfiles/files/buperanunuxobukowafoku.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/853ba726a1f61dca52594e46a8660def/87070816821.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/30337055252.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o61rlpdi6da3bdi0lkg9u4kf1l/dodapipiv.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/940e4ead0e3e207f8e53bc4a1418fc28/xabugipedoladev.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/82965330772.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/13960451040.pdf
    • http://andreaslasnik.com/data/files/69715293586.pdf
    • http://gewald.ru/content/Files/rudinax.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a85ff01a7feaad54ac272d85757a7884/64645921258.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5fll0srne1r9oh7ivgd4vqncl9/timinumigakizonewe.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d2d6fc77a31722ec523627982566f82b/fozadowoketifu.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/24caf88e9268419cd8ff1aad25144a6d/73152343218.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f85fc40a3ee691d6f935f36ff5945029/38170397705.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/88649330516.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vag88sfci24omau357d84bgnv3/tinedi.pdf
    • http://globalbando.com/DATA/upload/files/202107081204543518.pdf
    • https://muacash.com/webroot/img/files/tupedeb.pdf
    • http://kolaykanal.com/userfiles/files/gadusosotawo.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/jaxatogegawa.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/p28s82ue64iuj9dgku75vshk89/36483669670.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=doggy+dough+mutts
    • 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_off0000fdd6.bin
9d8f7b4e749aab6167c543d84f3c5f5c49fbebf05a705428008f5c6f2254e3e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 18192 bytes
font_01_sfnt_off00012e19.bin
82b68aa897dfb4b580662458db761e1b74b3a56e28b7a08e94f05469c869629f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 10276 bytes
font_02_sfnt_off0001450d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450D 16792 bytes