Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c24f77ed94d60e1…

MALICIOUS

PDF

136.0 KB Created: 2021-07-14 04:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eaaa7fbd0d0d98cad1be3f8249f8b26a SHA-1: 2dd5e1791dfd81b9060e465737ca2f59c1c2f729 SHA-256: 7c24f77ed94d60e17d9b6b0c2735760594fcecacbf8208bb6ff7d7b1ee4ac28e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to external, potentially malicious, sites through a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/6opl4rv5s6a1eqskhpeuor7ead/47601344449.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/e1rdh4uhg0v4hijcojv09pifaf/kunazaxunemobik.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/78166328032.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f1c26657---sivodovurete.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28415af34---43896594771.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df63f43018---vovawu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b446e3e0536---45598685978.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tuvenodipusuwij.pdfIn PDF document text
    • https://magatek.com/documents/file/83306744726.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6bd6e5c0---nudevawewabofune.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503215020528031.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ffa14aae---96026187500.pdfIn PDF document text
    • http://sushi-belovo.ru/files/78276861266.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/49073489143.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/baa109c107fe5aa556b1df3f9b79095d/zazibeved.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n5fjl760ok4l9lrrduru1uor67/malajarubirerezutozojaba.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/i0udrbq9mtd96g742qp2njhn3b/38428035573.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7708dbcfd52b186fd9d5126a269cfd58.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5fb9a755---8345137670.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4b6c9706eb227ee60185e6d91d2312d9/98191912186.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228cf7ec0f---sumaxuzulaxur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2275a73fd0---85323544978.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/isnadufjdb1gdm44rgrpuml0k4/zanivakibavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=traffic+problems+in+citiesPDF 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_off0001a0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0B0 3900 bytes
SHA-256: 47fec07f7390018d61cda650048054b69f6979ec7cb4ab84cfdb4c0090c68c0e
font_01_sfnt_off0001af64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C776 20280 bytes
SHA-256: 4576fa00ec62a308c3fe3e459a8de07ce5cf95deb07333ee5a6b247175b4d1c4
font_03_sfnt_off0001fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA61 10744 bytes
SHA-256: 2418af699efc465e55638458218ad1023f75e317266b9c37a3601c9b71f7dcbb

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