Malicious PDF — malware analysis report

Static analysis result for SHA-256 44760669210bf1e6…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 06:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0a44e38f4ef33b2944c9ab7e98addda SHA-1: bdd634b3557bd2ede4261632ca1d129e3e370330 SHA-256: 44760669210bf1e62391f33ddd7dda4e8b6df1d776a0e8996b5df58845923865
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the link farm structure suggests a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://saokienviet.com/uploads/image/files/79115134153.pdf
    • https://rusepress.com/uploads/wysiwyg/files/jafeweb.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7802uf4btjhh7rggvpjpt3vh2d/14920475184.pdf
    • http://ankaser.com/userfiles/file/32504609987.pdf
    • http://botosani.ro/img/uploads/file/5514703820.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fdcfc45---razokirubojofojovukikokop.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1112bbc6d35ed61cc8a088b5b71793ee/furuwitubuvopojaxinuz.pdf
    • http://vizesblokk.hu/files/file/51798857869.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487a3c581f---wipisamotefu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c67ad838---rajis.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6cd463e5e3df38edffe694675ed6df89/tojuzuxiwer.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ghc8isb20dkunmptep64gqehd2/79214113463.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f82bea4e6992efad171fc8bab8a9a7ae/tatabawevaxulugaxapif.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8e8ab7e8---87662565640.pdf
    • https://shopabrang.com/images/files/85706400078.pdf
    • http://edu-family72.ru/content/images/uploads/file/81624651653.pdf
    • http://lamekatus.com/uploads/ckeditor/files/xabugulik.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160861fe8d3498---49475279850.pdf
    • http://studioboscono.it/userfiles/files/mujikabiparogapekopu.pdf
    • http://www.acta-mobilier.fr/ckfinder/userfiles/files/15653392190.pdf
    • https://eminencesolutions.in/resources/userfiles/file/xasivopokebawijogovoraka.pdf
    • http://baigeleather.com/userfiles/file/xavoliluj.pdf
    • http://sicilyontable.it/userfiles/files/68620461983.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93722838303.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+i+download+my+voter+id+card+online
    • 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_off0000ec96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
font_01_sfnt_off000104ad.bin
70a92d7bb39c4798b3e3f07d4404e23f66fc89b6afdad54910529e98d345e218
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 10660 bytes
font_02_sfnt_off00011d22.bin
fcfa9f6eb6f66a83a0ae771acba86a3e2d01fd267e679c88ffa59d03c414f2b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16764 bytes