Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978c9f6aa555d38…

MALICIOUS

PDF

121.1 KB Created: 2021-07-24 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af4ee653de55862a9a0a827b258da013 SHA-1: ad9c85c24e79bbcf93e1c89a8300c91531ffe862 SHA-256: a978c9f6aa555d385c48e8df66660491f415fb5fe2e937d554b6faa00601f7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm hosted on compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the use of disposable hosting and link farming tactics. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f9d76e034---derunaduxebiwe.pdf In PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/83645459024.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/96967573478.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kipenolutabanapol.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39127a3bb---65064920252.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ba3c246384733f6ab908709728b4787d/30718174669.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c15e56889cd4086fd4818bd6ca3d4c54/45302218118.pdfIn PDF document text
    • https://sambelteri.com/contents//files/39133007640.pdfIn PDF document text
    • https://dm288.rs/slicice/file/89986168160.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d1650c58231b2e4ae9e81cb1ba243ce4/28581156504.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/terufojizufimoz.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/miluro.pdfIn PDF document text
    • http://ezibra.pl/upload//file/90995259184.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/14856335373.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/34536778418.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/62c0b961ba45b014c4492a159cc9919e/zizonesufejelizoto.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b64bec64c2ea07437c8c2e2944304864/raparovelu.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/55512683697.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/piwoxebakedoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90202d8aac---boruzogabubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+file+pre-intermediate+third+edition+workbook+answer+key+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_off0001717a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1717A 11392 bytes
SHA-256: 631e328960d93d1da4643c400ab0c4f2d9e299957802b5ecd7b44a9f3bddc157
font_01_sfnt_off00018bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC9 18872 bytes
SHA-256: dd4c59ca0fc42af2a3e3048c6036ce79b276f09671c7a74663a8a8a78a50a37f
font_02_sfnt_off0001be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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