Malicious PDF — malware analysis report

Static analysis result for SHA-256 307c73d02e5461cc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 22:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 397ff9785f541011b63143c80e71aed8 SHA-1: d62c275cc5e0bfb8538324347a568ae758eb517c SHA-256: 307c73d02e5461ccac614282cd1585fb893d417de12805de2407293847f320fd
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and several heuristics identified it as a link farm on disposable or compromised hosting. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://elskup.pl/images/assets/file/baboxavewimegoler.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705136dd94---81088111564.pdf
    • http://tribo.kz/userfiles/File/bipawirejadeladi.pdf
    • http://iproperty.ae/userfiles/file/zilezuvujegus.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134781d6ffe9---87162100405.pdf
    • http://snp-ent.com/files/fckeditor/file/164017218561364b9580cf7.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/76400447405.pdf
    • https://k31szmq42-nu28.com/contents/files/53738782656.pdf
    • https://4cmedica.com/ficheiros_upload/file/73493117394.pdf
    • http://studiomilano.eu/userfiles/files/74973033080.pdf
    • http://togclick.com/media/userFckfiles/file/lisosek.pdf
    • http://yuanyoujie.vip/userfiles/file/88733848366.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4aa2008e---wodez.pdf
    • http://jatechkj.pl/upload/fck/file/wunivod.pdf
    • https://dm288.com/slicice/file/werodi.pdf
    • http://phutungtdc.com/upload/files/xawivapuxufofukikeg.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dd8c9a8820aa605de98982b534e80a8c/9669954099.pdf
    • http://bettynblue.com/upload/fck_img/20210908/file/45097346841.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/61397177524.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/99362143123.pdf
    • https://dveropolis.ru/upload_picture/kidafepifinufunuxebi.pdf
    • http://jinsonmetal.com/Upload/file/mizuza.pdf
    • http://www.anclupnapoli.it/userfiles/file/jibagaselivizizomuzabofat.pdf
    • http://s-pack.kr/userfiles/file/20210903225941.pdf
    • http://geoodwierty.pl/files/file/18574227891.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=forza+horizon+4+mobile+game+download
    • 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_off0000d76e.bin
b5d8ff2069f6215a4a3f1ee025ebe2ebe819b1ae6e4c5c32360472d15c5731eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10772 bytes
font_01_sfnt_off0000efd0.bin
9ed102377707905caad83b9967d0eacadce59659ddf80f91e602a07a1620b539
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 17580 bytes
font_02_sfnt_off00011da0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes