Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4bae19ca4461e1…

MALICIOUS

PDF

78.3 KB Created: 2021-06-26 00:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d42c57e5d6779b68b98274f66395bdfa SHA-1: f3ad63f2133561cdeabefd04fe25eaffd0f7e125 SHA-256: 8a4bae19ca4461e1c3e94474618e8998e992f9682dcbb44fdc07d7063e5a6166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/40rpl3d7e8pula0cakja17hdgd/6367983636.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5348e1f9b8---vesigatufanuriranixaned.pdf
    • http://connect-senior.ch/uploades/userfiles/file/23006823547.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6prtusr3k0556l03rnn1q0iqdt/vukafododul.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5c1e62e4cbbdf6169e9db0106d4c6851/juxirobit.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b392512ede4---80427061919.pdf
    • http://domainecomps.com/documents/files/bozamopotofi.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/63024584292.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/gatefinidaketinawute.pdf
    • http://itkaufmann.com/images/fckimages/file/tunaxajutonoxozumokute.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pf4l0893tf6j3u5julbobk1ic6/medasavadijewupime.pdf
    • http://robalton.es/Albums/images/file///mikegalexebatep.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zadexarigugizitipiku.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad9b1eeed---5283340156.pdf
    • https://allmassage.net/upload/file/20210521044901.pdf
    • https://bodegoncriollo.com/userfiles/file/96064084671.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/758a7r1on0q0qb5hges8s7fhvu/fetufa.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607173d38e1e1---62651705931.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768775066c9---laxepesarevunaju.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jne6c9al313lp1aqmuhq50u0n9/jikujewanibosiride.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb6966eaa---39510367315.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b863b69acb3---ritijupivaxape.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8ff8c08ca02fdaa148e86b9aff31ac0b/65382413818.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=easy+baked+halibut
    • 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_off0000cdd6.bin
627a85d0ef4b044253289c01e218c3e2b7a9dd071670ce899a782de4f8a02cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 10448 bytes
font_01_sfnt_off0000e5b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 16792 bytes
font_02_sfnt_off0000fdc3.bin
342c4493e28eef1efd64e5f3d0281cdbab2757d6551080e9a7a40bb578fc20cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 18284 bytes