Malicious PDF — malware analysis report

Static analysis result for SHA-256 f722c046c5752d8c…

MALICIOUS

PDF

143.1 KB Created: 2021-06-25 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d533dcebfde9ebe4139012efa9882fd4 SHA-1: 4f54d955f2428238ab3522f10aa5d7f6f0dd4c6c SHA-256: f722c046c5752d8cc3e0e3ba141c321c487ecf2557c96c702845cf9770ec1409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or phishing. The presence of link farm heuristics and compromised CMS uploads suggests a tactic to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb32dbf65---belebikosurujobisajamube.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55a640681---tokowared.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2pii1ean6vs1hlpkkloin4nea4/numusetetidixixos.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/44185301741.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/59671078258.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/97715459649.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h9jqk2a8lv8cg5l35fpqevmlc1/98625869417.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf77855538---18009757833.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dajupegame.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c1c8a8ff---62768029324.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/26222110246.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/21636935276.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39cbba822703d396c4d33d83ad1a1bae/81491370725.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b32cfe70---nutilaso.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a019de10b8---xekewudij.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0e7cf97c---pedowagesumijikekevoz.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/jivagogixud.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608865112a1b0---momavetixaliv.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e9d67e5b792cde09df08637ab6d68603/93518363130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dynamics+of+railway+vehicle+systems+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001acc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4D7 11152 bytes
SHA-256: f8eeb30796fb6ebf9e2fec31d9069a6c68e6d51c42c9d75e2f039c01043eff82
font_02_sfnt_off0001dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEC6 16156 bytes
SHA-256: 651d4aab2bbf84bca91c3361ec53d061e7586b0794e8fc9310bef1d92ff11a44
font_03_sfnt_off0001f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F447 21412 bytes
SHA-256: 1c0e4a91a459ce0e30ed3ad9133b602a59fc5c0e51fb6e1a5c998c070f5f3c11

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