Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e793bd33f1e46dc…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 18:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a0eb4ccabe3655b695b7f130e6eee4a SHA-1: 55a87953df27c32e0ba359be7a9d8c791c09d310 SHA-256: 0e793bd33f1e46dc98631460eab40f6c02046789df5376eac1e72d2f2b29c98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f432350b---nanemijakapa.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/bgrukgsn57vvqi9gc3hdsb06j4/16854524898.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/17328562980.pdf
    • http://autodilykanka.cz/cmsimple/images/file/xogaziz.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/770c004d87d4911a2b1019fe5360b8da/16538426772.pdf
    • https://pavillonwohlen.ch/userfiles/files/81634956752.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/83167c2bb650c33082f38616bb4484ff/41357598434.pdf
    • http://www.tobywells.org/media/fckdir/file/77315840521.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/revad.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/jetulixivenasij.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/toriju.pdf
    • http://unityproductions.com/upload/files/63172528290.pdf
    • https://fceresources.com/ckfinder/userfiles/files/napebudejakirele.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6014eba306---63622162315.pdf
    • http://chongqinghaohong.com/upload/files/petagut.pdf
    • https://guijek.com/userfiles/file/kalodezuj.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/13917244966.pdf
    • http://banner-ever.com/ckImg/files/wuvaw.pdf
    • https://istocdukkan.com/userfiles/files/97801927211.pdf
    • https://rewaqousha.net/userfiles/files/35643993700.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/3447939007.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=atorvastatina+40+mg+bula+pdf
    • 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_off0000ee52.bin
db8d129126c3ca212f4506b7897a1104174d264502a14c8feebe26d7e5fb1420
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 19260 bytes
font_01_sfnt_off0001204b.bin
b8c6cc18ffe5625fa982160dc53d812a579a97d09126c7a3d178a7621876cf02
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 11196 bytes
font_02_sfnt_off00013a1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 16792 bytes