Malicious PDF — malware analysis report

Static analysis result for SHA-256 9276245b5ec4f4f6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 03:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01cdf4962bf1208f7c6f031ad7b4c8e0 SHA-1: 76cef9cc5e65c7d9397bb1fcd6360f30499c338c SHA-256: 9276245b5ec4f4f6864605e8b2155a9295d7cb49d36b71708bb094667c166eeb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/j5ec8vuqhkg04ltc7cp3nnh8qu/lamokawobuzivosogoba.pdf In PDF document text
    • https://digireg.nu/upload/wubinofuso.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/32926392374.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zubifelaram.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/kitolofulojasoraxid.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/buvixefikejolazoraxupo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8e9707508a3376485a89c50b82e6040f/kabikelejojojugeri.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/54764224166.pdfIn PDF document text
    • http://seamacros.com/upload/file/gokitagaduberemojotakoli.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/79596601596.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/dinebesagelenolagatuz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576d623c25---84487040537.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/xemidokuxeposib.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/vuturalidopogi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bc1316f2c09ecb801329c76b5af8363e/22671247377.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/3237267995.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266f1c94e2---nopogisofobid.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/74867202693.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6161dc3225---sezagalaximonuvo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855b187ae14---vixaved.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/33345830904.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/93224263222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=canciones+faciles+guitarra+acustica+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 20360 bytes
SHA-256: 5b8529cb652ed4b17fd6f5e7b41f65996be8dfc958a6135b5e66facbdeca8a29
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 10928 bytes
SHA-256: 082c253674a4428e6edc75e265e7a0737177dbbe765eb8d18475e3661ba704e4

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