Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df2470f826498a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 12:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b38131a09bbbd23c7e51f500d49e96f5 SHA-1: 5db02a93d5b6b30b27625b89ac44a4377ad8363a SHA-256: 85df2470f826498a033fc1e983338f0ecf10986a47557a8d5278449383f3250c
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and potentially disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics strongly indicate this document is designed to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a835f3ac2ab---17139433950.pdf In PDF document text
    • http://ud2-140.com/files/97723822276.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/27937659010.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/wugelodabaxi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dizorakobowasoxikosupu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2dca4a6b---suledisuwekeke.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/11329323822.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/unqssapojlscp26bi5k6jn4qv0/busajun.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gizib.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69dc6f303---raraxazem.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/kazipij.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5855c5c05e9f4e0584f6ed38762b30a7/dubopodufimeromisi.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/60962512900.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/zumevudovoxemobuwegoloti.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o9u9bn6pa6q0ik15aroo8sef31/85181805106.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad54b2160---xofixajizibagilolugefil.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/negabesusutodoze.pdfIn PDF document text
    • http://salt17.com/userfiles/files/xakaxuvekanaga.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099acc26b9a7---8158869159.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/jinexalakigoginojesinis.pdfIn PDF document text
    • http://unibox.lv/files/text/98781785048.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610df0d6e5229---16156358722.pdfIn PDF document text
    • https://hagepoorter.be/files/files/moxunoduxabonadoxavox.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878ca580e---pesisonobipoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=milliken+publishing+company+answer+keys+mp4056+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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 11996 bytes
SHA-256: a07695dfd1c89d297921ef3eeff1cb56ed19652891ad4e96c6a36ab614bc403b
font_02_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 17744 bytes
SHA-256: 1e4c457a2946c4a4f8e8bd534fb9ccad1e87bae5e5860aae130c2b29eb1eddc7

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