Malicious PDF — malware analysis report

Static analysis result for SHA-256 979afbf8299e4401…

MALICIOUS

PDF

70.3 KB Created: 2021-07-26 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f7a310b996e48a5c2d1e668d73251d9 SHA-1: 8149b5d9d41be10f3cc03bcd8333737fe57d13f2 SHA-256: 979afbf8299e44012099f9748a31cc881529eb323e0ffb8ee2e58ab79f1274e5
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and serve as link farms. These links point to other PDF files, suggesting a chain of redirection designed to obscure the ultimate malicious destination. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6257

Heuristics 5

  • 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
  • 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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c8fdc6d7a53e440db7042ed2d771dff/fawevijonupovokekolo.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc30a8adf---magazipapogoki.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608acba95efe6---7000620191.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e109434a---pepita.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb9285b56---betivowesikibagezewug.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f3343a922d324ed9e8aed5ac427d509c/zirisepojadowev.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kugajusiwavoravilup.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/84753778d5673d1e5bd910d148685040/nuzijudegimotilusato.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0802367c1dd92304e9cf9680c6d9d30c/poritorexi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/i66kt5nulsnrhqodgqc9t6bg0s/79055441894.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/urji4cath2phngjrl3clavis4c/jakuvunutajima.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/13265676042.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zibuxagigeg.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607161c4e0c7e---22091140769.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0312601802---gukusujofarodu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210705_110221.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b18bbc07eb269de16135733294e030dd/71870251697.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f60a6acad5aa3bc2802f947813194a33/povotazunarokuvebume.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/ganononowubuni.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085820fa0d14---82950618519.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/h39n5p240umnrqudc72doql7kh/metel.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/87954053813.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hsjqajn6uo687h3kou9el2g9q2/kodaxukezu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768682bbc95---rezamigugut.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/zoxuvikeboko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coloring+worksheets+for+kindergartenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16172 bytes
SHA-256: 120e35d69475b6b3dff346327ee7c08f5f974ea133bb496c4279e01652fc40ca
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1