Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a25830af3f33f5…

MALICIOUS

PDF

62.2 KB Created: 2021-06-21 19:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b78badaf3e9407202cc3ae0415cf61a SHA-1: 77e671b29ffaab62c45b655e8128f48e0e0f136d SHA-256: 50a25830af3f33f5bea71f381bf55711aa43a233378a92aa529e42d57afe1598
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain technical terms, likely a lure to disguise its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/209140b36aaccecbb3e0ecbcbd5b9719/53438464627.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c85b054e377403b01fdd190b9cbac666/59242501046.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecf20fe39---nuwedogawewenukizidej.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/786bg6t77coro63ah8uc7glsob/pekebozug.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6f34ca5b90fe09c5dd55b29fed0059e2/32704710626.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jqtvt7iok2jssed1gkjgi4h883/miwedus.pdf
    • http://aarogyamedico.com/userfiles/file/92321590643.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/86718058596.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b021dcd99---kajigabupoj.pdf
    • https://ewt.cz/res/file/nulupamaxagufojufo.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ncqsf7nqfuac21887c0v4g58m9/mejosogovow.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ab4b540da36f2919ab558308873bdb4e/gezajezi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cb10ba58117f5099e8db8221c9336f53/loxatabaxavanijuxol.pdf
    • http://umiyawoodworks.com/fckdb/userfiles/file/duzarovegeri.pdf
    • http://digifast.cz/userfiles/tivoferitita.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/45566044849.pdf
    • http://dienmaythanglong.org/uploads/files/81662934732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=servo+motor+wiring+diagram
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba64.bin
58b9af64417d7de0aab22c74094c1b62ac21e06fcc9c966c5847516007344b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 5188 bytes
font_01_sfnt_off0000cc06.bin
70fa16e9dc2866fd9c9d8a469c5f04cabd31762d24d5a1ebb03aec302901e0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 9280 bytes

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