Malicious PDF — malware analysis report

Static analysis result for SHA-256 cede43a582cb522c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-22 09:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6adf332341de97ea1c03747f27087195 SHA-1: dd3ff4b8b207dd07e62e8c36afd0d138f6299015 SHA-256: cede43a582cb522ceb66c8f2eccd52fdfe89c8a27e778cd799a718e69cdcde5c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its direct content, but the link farm heuristic and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c358ebd4---jetisow.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eb1403ea0414ef4caab1e75f9a5ebc7/65337187775.pdfIn PDF document text
    • https://avenue102.com/uploads/file/43047689273.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wixamiwevipenererimuvul.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/moseviw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/48e523a3d044555c0d3369a0aa129744/57313616023.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/50425967289.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///21709256.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/ninozatuvejutowe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a1a3a1e6---91936920659.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5def9beeab4f56206debc2845305159c/82959011235.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e99be03a2---62556306623.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/85097698913.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc709fe632a---85907875695.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/db73c3bfac3aee3e822684834bb2d702/juzumijono.pdfIn PDF document text
    • https://saporidelletnastore.it/file/70472481573.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dinukumov.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0pc7nagmacc2ansrakj7pingmq/wagetuxejedukewunani.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/ketijoremuluwometosi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f2307892a---23264989106.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5f096e302ccd564813bd5fcbb6230980/70056274452.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57b14b1e9---pudujibirufuba.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/24164251723.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/mobezubojisezewupaguvupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=harry+potter+1+full+movie+watch+online+freePDF 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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10984 bytes
SHA-256: 76f3582763602bb52b0733acdd4f962cc30cb067157894e06eaead6a8b902091
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 17600 bytes
SHA-256: d861268b8f99cbcefd585165a525f69bf54c6475bb92a6cc83a4dee64368db8f
font_02_sfnt_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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