Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fd08d0042ac14c…

MALICIOUS

PDF

100.6 KB Created: 2021-06-26 09:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 201f865093fdfa35c280cd70ff9927dc SHA-1: d0a90a800b2e8c927082d4f6d1388cbe972187b6 SHA-256: 24fd08d0042ac14ccb8f611d4cfad48a96453f382d7db1b1a6dd6d1e08668d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://mamo-tato.ro/userfiles/file/reladaduzasewekikiv.pdf
    • http://samnakthodrahassob.com/userfiles/file/13210791230.pdf
    • http://podushka.by/files/files/82587495294.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c4b73d236b6afa37e834c475ea0a25a1/sudakavux.pdf
    • https://eobliecky.sk/userfiles/file/dezegutedizotikasosogivud.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/54644015150.pdf
    • http://iehyun.com/editorupload/file/67326869206.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4e3f2ba338d6a6bec1135c98a7fa2481/49346676331.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074736f723e7---kutaxivik.pdf
    • https://t2sc.me/userfiles/19785855849.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c436a5a881---fejifukidivam.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1926c8bf4d2be8d5b5b4b31b7c418721/874627953.pdf
    • http://metaglas.kr/userData/board/file/dadiwilas.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/42379143752.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/6d8cd49634e0700d1ba578af357ad25b/vurekoxexirega.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef66b4e777---29635151507.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70a237233f---70997089622.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/99282401883.pdf
    • http://temple.mo/userfiles/file/2208193558.pdf
    • http://jiehuist.com/userfiles/files/pefabajugafipotogobuf.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162385557320.pdf
    • https://edubox.mn/uploads/users/0/files/suguluzilab.pdf
    • http://norilskgu.ru/userfiles/file/gorijovatidoduwujik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ringtone+old+time+rock+and+roll
    • 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_off00012068.bin
1c8b0bbac0fe321b82505e0c07eca590637519d6fdcdd90f5e7207382ed319c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 19988 bytes
font_01_sfnt_off00015349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15349 16792 bytes
font_02_sfnt_off00016b60.bin
5a65c9adf38d888aa8ab839bbae2615665fd66a22132074805de6e6df0c97561
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B60 10684 bytes