Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc451d4e469ef0b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 00:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cc3bb2a81f14fb34b53296eb65f808c SHA-1: a00af9fb61a0d2372e824836a35762625e25eee3 SHA-256: 8dc451d4e469ef0b4bc02ea298fda935313149730fcd201cd86f7c4299df5a6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests a tracking or campaign-oriented approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://terfigyelokamera.info/files/file/davun.pdf In PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/15899809193.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/26354644834.pdfIn PDF document text
    • https://quizai.com/uploads/files/sobijawexinoxupumuvok.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • http://kahasat.cz/data/file/dolagewumilegi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/52045408743.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xixixatopemelu.pdfIn PDF document text
    • https://alohasafaris.com/files/gobatosifupaluri.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/40398471066.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/2505791909.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/60668554394.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/16644702694.pdfIn PDF document text
    • http://fruitvita.com/files/files/xirobusulu.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bijotilukekodawowag.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/mijenebubukuwukeludi.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/80823620401.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8372acb4d---podofuroje.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/roxinesovekubufopux.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434d39e7073---melevadorusotakudagiven.pdfIn PDF document text
    • https://argumentua.com/i/file/tanojiwilasi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614faba2ed104---sozezajubovabomadowizapa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d89a14b8c2---5706679920.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/88882038260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=friends+watch+online+subtitlesPDF 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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10772 bytes
SHA-256: e9e3a90829990c231c090093c20dd450cc8df159967b806140ca8a3f45d7a428
font_01_sfnt_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 16592 bytes
SHA-256: d6d6aedef140114588cb1c3eeb7f6a3dde8aa90af45febae20a66c1f6f7c9052

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