Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0a57ec8b9f464b…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 03:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd921f4812f57933394d6a7fa6ebb83 SHA-1: 0ff337b9fe628a403b75610ab37476b1057ea937 SHA-256: 5a0a57ec8b9f464b64003f7307ebd6e6a7125bcebeb6248329a4aa747285dc2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/645a4fc0576a9ffae56fa21b2ae69499/90685011566.pdf
    • http://quickvideo.nl/userfiles/file/jobez.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8994f8b87f34b9813dd0cfc457364f86/gunepupa.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/5151775388.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd64f892bd---77650611642.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e3hl9b93vkfm0snl4iipf9kvnp/93965717762.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/796938537.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/xoladesalepukegap.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/34ec15d1i5vh5a6k5p1d5e4vot/16773577117.pdf
    • http://burattinojatek.hu/userfiles/file/xapopinugasedenolimo.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/82c0967aa79761a86ccd011dd4d4bed5/luzoxanaxi.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/t4svh7lor5gv4hsitm2erd2k7s/roras.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3c6e686d---23327842647.pdf
    • http://www.cbs-emballages.com/upload/file/musobapozob.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa460e8cfe---45801571071.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9662e1658a---gagajuni.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/81dfa81f1fe7a9eae64fa93644a637a3/64549345474.pdf
    • http://elm3rad.comfile/numumimazef.pdf
    • http://scvumaichiramen.com/uploads/files/xefuziseguwowufubarexakub.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e0b51180e---kozadigazobufebulaxof.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/mvt7aamepnftpbohrrhc892l50/digokuneli.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7e1a65a9---zowesi.pdf
    • http://jrpst.pl/userfiles/file/9326082529.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/cb72a5aef67be77620e11266f07e9e6d/8275286769.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rottweiler+and+pitbull+mix+breed
    • 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_off0000f2a7.bin
6b9e6fd4a383de44aba04b091ff8e974abd76861b3176e8362a6314a828a9007
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10860 bytes
font_01_sfnt_off00010b79.bin
dc8197472904d17dae009f8cbe257c9b73d33ddb10987fac13213afb2db095bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 16384 bytes
font_02_sfnt_off000135ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 16792 bytes