Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abce1f5d8f1b252…

MALICIOUS

PDF

76.2 KB Created: 2021-06-14 13:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d934b49fb38a3df829b7edf988410ddd SHA-1: 38d32496b1b81bf80aa0d6551ccbeee368e73868 SHA-256: 7abce1f5d8f1b252550cc5bd952c60b7868ea4d5def8b3a48358ebf099e1fd43
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to external URLs, some of which are hosted on compromised WordPress sites and potentially serve malicious files. The document's content appears to be a lure related to IELTS exam preparation, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=ielts+general+writing+task+1+sample+answer+band+8
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756a385133b---wederivejoviwemelosupefik.pdf
    • http://apvn.info/userfiles/file/zezowifibuzen.pdf
    • http://hyperasp.net/userfiles/file/betixurus.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6550de9f---38805084389.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1a9045bb1f7f439ab7a7f788ab22fdf/46847958047.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160998dc672c9e---pidewe.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b404bdcbac2---dabagolimorok.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49e4e4e5f---15461464908.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e31ec5a1b---24031589069.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85d4d9125818a8f76c86a329ae78007b/malezemu.pdf
    • http://remaining-mc.de/userfiles/file/badinejaregalowibusekeveg.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160745ebb04dda---fisejakewobomivija.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4bf504822c5955227d49221fd85910e0/pobovifadutulusepukov.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ef41a590---lidiwenalimegusarorefen.pdf
    • http://littlepearlbooks.in/data/eimages/file/tumojediriboxez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ed57.bin
215a308bd8bd636ea46002564f870653edf15003bdc0df71ec4c08ba455b3d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 5756 bytes
font_01_sfnt_off000100ef.bin
5578bc8642a79c7559ead62302291e99ad4f79fdf79a64f08461c50135904959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10244 bytes

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