Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93f5c0d000616cf…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 10:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85e3638b1f1f297cb52ab3341c42e514 SHA-1: 41eac05d92dd6c3c0235a51c4f7b0f7d25367cdb SHA-256: d93f5c0d000616cfa85176c6271601904c12ae0b66d18dff175ddd02b8dfa487
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a link farm, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ac8cbefa---vofopigixatanirofuman.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/26237471013.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/45581760545.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79628b0cd---rujejejudomenefebazawuvek.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/12002945807.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/61651875666.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de66a5597---40184298244.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c991a960721---66165279349.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1fc5d88d5---50279222022.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/mamarexoxewiraxoviviji.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/33120813915.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f57b9f23---53502560938.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/78828827322.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b9pau6dnrnq6us7vsa4lbdjven/13309962619.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d87f123e---pupukukafuwugor.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/edfff93bc3e31196d606f2c3b8c8186d/ponafawa.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/28990311907.pdfIn PDF document text
    • https://panama4d.com/contents/files/tipumaxusaxavo.pdfIn PDF document text
    • http://centromp.it/userfiles/files/marum.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/49849750026.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef709c1f6e---3956850102.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/5228122957.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/62750495960.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/211933b07e17c5694d1fd2e4eb05c922/gilalitupu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rg6e9gp5ficuosu1ooe71vu7h5/71601101646.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///94943914608.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/97343718643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exposition+of+the+blessed+sacrament+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 18960 bytes
SHA-256: 223afa35415d1ad86246762a4b7b8e637163320120e1a06d864152559ca267c5
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 11112 bytes
SHA-256: 706c9c2d8d84fb2d22221fe2c479c1ce2f698f27a75a9b7fb24d0c0e20634151

Open this report in the interactive analyzer, or submit your own file for analysis.