Malicious PDF — malware analysis report

Static analysis result for SHA-256 f131f96f26bda840…

MALICIOUS

PDF

84.8 KB Created: 2021-10-19 14:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cca0a3a1c4c1c409a8b4ca76a32bfc0b SHA-1: 4fc495be8a8b8faff19ea8d239d91403c543dc81 SHA-256: f131f96f26bda840b259062639d59da5ed47e173f4c91fe8eadda37c31f3daf3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=how+to+determine+turbo+trim+size PDF link annotation
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/filemokidapusuba.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448726309a---ketot.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/62200121391.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/49259394907.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/427f35bf484a6e8455a3bebf3f768d7a/81603101559.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/53639174141.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/96697606308.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/46336464308.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c464d290---53970846066.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/bedanuvekabu.pdfIn PDF document text
    • http://umutisi.com/umut/upload/files/zakirepitivatarigosog.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/90382186281.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/21588498626.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/49882363486.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/37449768406.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/55423627067.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/31109370375.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/guwepirunefilupufeteva.pdfIn PDF document text
    • http://wdnederland.nl/file/vuzajumebijit.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/91745186479.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 10580 bytes
SHA-256: a9c448f9b923267feea61546a7e304ae318368de63168f3702c212cc706582c4
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 18152 bytes
SHA-256: 70561ef5c4def84acad2495e009bd1704bad167932564af0b4ee55872e014e7d