Malicious PDF — malware analysis report

Static analysis result for SHA-256 da958a0d8d2bdc40…

MALICIOUS

PDF

86.7 KB Created: 2021-09-26 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d334cafd287513ccca169dbddb98ed84 SHA-1: c7dc19547c6b8b365253948ea2270bd3aadd7db4 SHA-256: da958a0d8d2bdc40b326bc9f7b83e19663b850f285fdfb4256d96d2eed61b5ab
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to suspicious domains, strongly suggests an attempt to lure users to external malicious content, likely for phishing or malware distribution.

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 http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630865800.pdf In PDF document text
    • http://gayaarchi.com/userfiles/file/20210913024648.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/jekubukojidozusiwidu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/maganikevotatixutodud.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/bifuzotapudomigina.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/58945844088.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/59186096370.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/49184585192.pdfIn PDF document text
    • https://ksboutlet.com/file/files/2444328551.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kubebelabeku.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/vuguparuroko.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xiwazemaxeguzakupikil.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/56904715768.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bipuzapenapozit.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/24248476672.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143253a390a1---nilasijamaxoxov.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/619db0a0a4373fca3677a8dc3a1969ba/86106541225.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/xizefejupedijopiveteke.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/82459410569.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d72dfdab---4105023702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gi%E1%BA%A3i+n%C3%A9n+file+apk+tr%C3%AAn+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/96640722842.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 22812 bytes
SHA-256: 5fe8ed140351326115f7baef2c8604d4fefb223c89acf1a684d2d43c8c10c11c
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 11004 bytes
SHA-256: 5845c3d1ea7d9887649ac156ca00042582947d61b3ad0ff080de6307ca182420
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_03_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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