Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f189c235cc4c3b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-02 02:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9cb35c095a6cfc164e1bed6c6ffe8163 SHA-1: 8d357d13bfe8d849042d324942e121302ba004e3 SHA-256: c8f189c235cc4c3b922167c312e437b9253e6fddfa24f2beba7992e9a07d7fad
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable or compromised hosting supports this, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d06212b00ec51b346560212b3b917aa0/85505498081.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f7c4f0ee4421aafa32251f40fbf23bf6/bumozibaj.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nulebobotekus.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/supewelivigurab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95e825e16473d6304ce3e6d8db713116/rozugajibezeludezuma.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16081d23d834d5---surajixepegav.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/5484404368.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5ac4ac1e412b6612952b264a334a2db5/zubaleteroxomelefiraje.pdfIn PDF document text
    • http://m2m2design.com/userfiles/lixifujotipigateweduk.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruwanogite.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/todowunitusegebazudi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/384f305c525577742b5f0942f7f586ea/pisirezalozowipirodif.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/784b655bf5f70233462d4c97f037e0e7/tologadisufefuponirefesij.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/42885298474.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210802_51EC38AF87AED050.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/dumebaseravum.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/17591901952.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/40550614264.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d2268130---87978139956.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/414c5f0beb083caa747d4fa014c7cfc3/dukebetamukutire.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/megegibumetulixavizu.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vipifibudeseb.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083953c6b6b3---panegadine.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rrirb4k684ig1vci3267uhdrc7/vezadovapewoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=indirect+expenses+examplesPDF 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_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 10608 bytes
SHA-256: c9ff2dff2c03ff49416a1f8533cbfd69cc282470be01e3c91bd734069875cff8
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 18316 bytes
SHA-256: 845b5226f407e2f492d820b826bdfe2a8c56f3b8b453bd90eeec28a792eb449d
font_02_sfnt_off00014c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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