Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fb266463a7d5d5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e56f1392e39f405c15f57310a0e37ba SHA-1: eb935c6acf794224c88962c9bcffd69e2b9a3a3d SHA-256: 51fb266463a7d5d5ce58220ffb30be8ef3643d5d23c433f9002acb212ce6dc7f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://capesociety.ca/uploads/files/90224883051.pdf
    • http://masan315.net/board/imagefile/file/fugudafeditawunesi.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/fasuwazamuxovagexegola.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/19130639486.pdf
    • http://lukinserv.hu/file/gadaloz.pdf
    • http://stevis.cz/files/file/vipozazupidibo.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137894fde51a---75143266935.pdf
    • https://arte-salon.ru/upload_picture/80787193815.pdf
    • http://technocom.pl/editor/file/tuxir.pdf
    • http://vattuxaydunghl.com/userfiles/file/29377018969.pdf
    • http://findingthegrey.com/userfiles/file/wuzejifalexag.pdf
    • http://irs-messtechnik.at/upload/15401369338.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/bupemasugenerufafifaf.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1ccbc364---18274957666.pdf
    • http://anpo.vn/upload/files/tobovasadewuwuz.pdf
    • https://krusomying.com/data/file/pisiw.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/22596649057.pdf
    • https://rails-bg.com/fckeditorfiles/file/3802188386.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/jedalapun.pdf
    • https://fultoys.com/userfiles/66117571088.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/69443728316.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb6fb69b8---25215453796.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=golf+clash+mod+apk+unlimited+money+and+gems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 16792 bytes
font_01_sfnt_off0000df59.bin
95bbf091eadc0258e09c0de8d8b846416069e110f69ab1ff1ac87023db3252fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 11312 bytes
font_02_sfnt_off0000f9a0.bin
7d3ffa9804b5cb64ab1f9fcd3dec0d66d46045ddea8520c72ead322a0831f6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 18116 bytes

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