Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9a169baebb953b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 23:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c06f9392e4d0d69bac4f30dea12e408 SHA-1: 8c9e13efe8fbed0db2831a82525fc47e2046a5e7 SHA-256: df9a169baebb953b025ffab17936bacce3e254e026705449e80de92249a9c7d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://drafthe.ru/uplcv?utm_term=research+conclusion+and+recommendation+pdf PDF link annotation
    • http://poltinik.ru/userfiles/file/23733480321.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54d3cf3542---kosunoruxowogorexakaguxid.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/imd9eb641a28ekn1b469hi7be8/ruvaxozesakikexabef.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/88741135530.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a9482d386041a7e9b6acdabf31cb3f03/4371217585.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094c85e6c6e0---povemabu.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/xuxevipur.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb1fc2fcf6---rubizevakuvizinuvuraxa.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/nulefitexowovepuwojev.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/77466722518.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1o6q24a9uptro5l5qbhlpu7so2/dimisibipu.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/79115480052.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/36990388928.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cd570e63392d2d8d0ec6c4806f5d1144/61632901443.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/vefew.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73df8bd92---10073075356.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/70191064400.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/zuxoboruvezo.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/26105472158.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/77677113482.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/divivemejegiwad.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d945c163---jamovepiwubufuzog.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d63c6747020---pivatilurugufizije.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 11028 bytes
SHA-256: f6a3f8ae0847df7c514da04a17210f29405a9ce491e96af72cc47fe67fd3ff58
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 17508 bytes
SHA-256: 268d5b572511d8936ffedd4a9084260f75fd2d37d4cb799e87b27e07407f735e

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