Malicious PDF — malware analysis report

Static analysis result for SHA-256 21885168f25e1ee4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 02:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e2a21135c7ed4cc81b3a7809f28d6b3 SHA-1: afe2cf84c435572cf63f3eb4feb11cac0fb1a295 SHA-256: 21885168f25e1ee4d7c77ba5d7daf223d8e65779ef3d68fca91390caaa49dacf
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including WordPress upload storage. The presence of numerous links on disposable hosting suggests an attempt to obscure the ultimate destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://luminex.pl/upload/file/kijogupejewakareje.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f91392fd14f74e3b0ae1960ddd8972f9/degodewukovaset.pdfIn PDF document text
    • http://allycatering.com/userfiles/49984821831.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/pejoxune.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/zepirerasobatavalexegabuf.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/11458705552.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4325au00peb3sp0i1renroq282/20129323228.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a940e5cda610acf0cc0ae5d3dff90588/39745208365.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/majibilenabonotajerifop.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/29386567069.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7579472a03---lilafejeburufatotusoned.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998694b5da1---dijemulozomevadositepime.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/nuterufopixatemu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/j82dginb48264rprcsom5f5gs3/88338294702.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ccbb5deded1e8560befb250599d7e5cd/96852277397.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/nesizisupulo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc24fc6118---vunibovut.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/movuzapafipogegovifuj.pdfIn PDF document text
    • https://topupdana.com/contents//files/pumogikuzewa.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/xiwebamudowatifej.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090850a68b1c---bigubapejinafepov.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42dabd02b2---fufofa.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/89072476274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=prepositions+worksheet+for+grade+1PDF 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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17456 bytes
SHA-256: 1f5c59298461cdad43a7803c474d27db95e980aeeb5aba3f29608c4c2d9708b2
font_01_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 10960 bytes
SHA-256: cdde5933d2fd3799a58cb82e15b48abb9ce23e3424497e8dac29491973d1ea42
font_02_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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