Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e987fa2e5bf88b…

MALICIOUS

PDF

68.6 KB Created: 2021-06-22 16:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4065704b84159297851337e75665c97 SHA-1: abf237de76063b2d1db5685b93488bc87b579284 SHA-256: 20e987fa2e5bf88b968bceebc7015ad969938ce449c5d58790ad86eede3ded86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=weller+7200+soldering+gun+manual
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/plea0hfsbukrq5dpb2jkm86893/sobazozebalasuwaziruzilu.pdf
    • https://marljivo.hr/userfiles/file/misor.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7af272b00---femopi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb715d92ce---sixonaxaxezekaxojibu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d59947d4cc---24701741073.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf82b75802---1775502906.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5dbcc1798---95017727322.pdf
    • https://hashtag.school/userfiles/file/wivulujivej.pdf
    • https://alice-immo.com/userfiles/file/62983161056.pdf
    • http://www.toptehnik.si/images/gevuga.pdf
    • http://allaboutdowney.com/userimages/51496799514.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568673ef57---kitijawazizikesep.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/402697c5f4b8fbacfbe87f5442ea785e/38515432541.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e56d5e98e---sisoxabazaroxudejaronowis.pdf
    • http://allprintusa.com/admin/images/file/71372380896.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fvfbvoiu6da3sfg0dnht17i39/42799469207.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b48967a55e7deb0e630accce74768c7b/rewuwas.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4b3587cbbda66038a86ab99e666cce6/mawepujetapoximugamoz.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_off0000cc3d.bin
5ef94b3bb7d950b9d04484cc19b50263f9f05475a30da6ae489cd187c1b3bea0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 5512 bytes
font_01_sfnt_off0000def2.bin
a9407c1ca05e365858695f9fbb5574ed18be34c8db868025faeaaad0663c7fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 12204 bytes