Malicious PDF — malware analysis report

Static analysis result for SHA-256 794cc9b7a7dfc2dd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 11:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d282b3ab8b1b578e2fc649b5dc2376d0 SHA-1: 98194d6eb7b33243ed6a68c05b5caa1a786fa9f4 SHA-256: 794cc9b7a7dfc2ddd01475583d6afe823a3b3162004bdade72075e5aa28eb37c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents a link farm pointing to various compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to malicious URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://energy-labels.nl/userfiles/file/98293251877.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff1c280b3---tenutudinamipaxuwidugapex.pdf
    • http://studioesflores.pl/obrazy/file/begiputelifabogul.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/10003084521.pdf
    • https://nusbetaja2.com/contents/files/kujeju.pdf
    • http://icoenergia.com/userfiles/files/76799511120.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/taxusasajosejajemaxenu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq84nve0mt8ohopb5qep6fbg6n/95008560776.pdf
    • http://garankuccu.com/upload/fckimagesfile/9528a616950a2da06a75ae321b99eaec.pdf
    • http://odumakus.com/uploads/files/7204627441.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147df9491162---kinodozusokofevotapiwapav.pdf
    • http://mawratanews.com/armedia/uploads/files/xemolinoxuxoxebu.pdf
    • http://studiodugnani.it/userfiles/files/xudugeduvamomabat.pdf
    • http://easyhypermarket.com/userfiles/file/72309860608.pdf
    • http://giasuminhtam.com/Images_upload/files/javefoxojaweg.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144521b48403---filuw.pdf
    • http://goldenstarhotel.vn/images/uploads/files/zexuwe.pdf
    • http://tdbm.vn/upload/files/jivujizulularejo.pdf
    • http://provia-events.de/pics/fotos/1/file/lerul.pdf
    • https://advik.net/userfiles/file/topelulaguteduwikaxogolib.pdf
    • http://carnow.jp/js/upload/files/26442825135.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=atomic+size+of+aluminium
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/goletaxujisiwerix.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_off0000dad5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 16792 bytes
font_01_sfnt_off0000f2e7.bin
26c7bcf4496598c588cc0fe65302c374c5142d3a33fc31d31962d657b7f0699a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 18132 bytes
font_02_sfnt_off000121ff.bin
b058945e99129839148fb5a3b913965ba79a0d1234a200872b5130d3dea73711
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10540 bytes