Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0de28c6efba26e…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 00:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb3d61ba34f6fbc7ea2e9bcdfbb00b2d SHA-1: 3c33459de1e0822edd0a62379d2b2317b7a98d6f SHA-256: ad0de28c6efba26eba3f1ebf723ed59665e3305062a7db4a7cc63994a6c26d88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links likely serve as a link farm to direct users to malicious content or further download stages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://architektor.ru/uploads/file/69150132308.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/pudukopu.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/41525763779.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/kebefikomuzili.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16153fd1279832---jijusi.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/39511422421.pdf
    • http://megalaserasia.com/upload///fodulakegivobeni.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2ebb7fd6c36e010e57475ca5d3977929/71121050109.pdf
    • http://bularz-auto.pl/images/userfiles/file/mepujejopapik.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f84e659e6---23440928397.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7351bdf916e6039c49c71129ede9ad07/neduw.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3385f775---lujuluzolovowegewujoje.pdf
    • http://silver.jo/ckfinder/blanc/files/69324686611.pdf
    • http://msmzizkov.cz/data/dokumenty/83387955732.pdf
    • http://khacvietlaser.vn/public/images_news/files/64801924295.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/favidalaxumepulazutivamak.pdf
    • http://annuaire-regional.com/ckfinder/userfiles/files/vizuvasabulejakoruvegubo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161567a9683baf---16820968453.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/sololatewezel.pdf
    • http://nova-auto.com/upload/mivavubejefewek.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/90887490058.pdf
    • http://xhzhengli.com/upload/dupubobuvubisim.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/60583527658.pdf
    • http://shendaoguoji.com/data/attachment/file/32833222956.pdf
    • http://mackyz7automotive.com/js/upload/files/fokejamu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=american+popular+music+4th+edition+pdf+download+free
    • 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_off0000b49c.bin
7a5560eff0af468fc9dc5d8b7949db0aeab3742fa31dfaef8dbd46525c11abf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 11128 bytes
font_01_sfnt_off0000ce77.bin
1cdd88d2e7c4cdaa12b354ac849dfa80b026c71430738093a5273bc7ed1789ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 15468 bytes
font_02_sfnt_off0000f541.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes