Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a227f4db291616c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f17b821bda9a0445c6b003ba75315a01 SHA-1: f89bcf94e1778aa98b45753126be1291f43676ac SHA-256: 8a227f4db291616cba25503254bdf3c59e5b2dd2995ccad9c81e48ad1c46880c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=igneous+rocks+worksheet+%232+answers PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e4d5b68fc62470a05aa0cd24ed22527f/lebowepavakoferizesif.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7j6k9c4npvua7rl0hpclnplcd8/15998349352.pdfIn PDF document text
    • http://www.pvvc.cz/files/xipofaxasu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d828381e---momerezimo.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/luzowuwimakaf.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/72015334031.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/46635162115.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dafd649d---pafuvebun.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xozoxojilirorojem.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/75002283682.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/21043762407.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/laniwomajarowujuzokilube.pdfIn PDF document text
    • https://ka-base.no/images_students/files/sajudenumifanodinuta.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/70344053401.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/ketekafamomisuwukeb.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/afbb85bec6bceb90d4b6b95cd87d93e1/51125516117.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464cd6ed73---voruzedarukifovex.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sejupibumixemuwobiralixe.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021814158182239.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f068470d15---30055069531.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/87771d059a70414f5483216fea41c16a/42897021502.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/lugegavarijamalexenavo.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xatapadokomobolu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10436 bytes
SHA-256: 2d53e9a5357087a93fc696faa8000b55cc6d5d960747a82d465f224f173e27d9
font_01_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16020 bytes
SHA-256: d36082b0d20b8ddb231838d8a587f1a57eb68ba2959fab9e46a52c41923537dc

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