Malicious PDF — malware analysis report

Static analysis result for SHA-256 6effcfadd8c5f63f…

MALICIOUS

PDF

82.5 KB Created: 2021-08-14 22:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee7225e72127a5ae39a88c554778ca7a SHA-1: 51abc93b6bcb7bc28bb1e29d258dd1177a1d8d81 SHA-256: 6effcfadd8c5f63f26483ebb3ab83f6deaa952f5e71047818c045c6c9d18de21
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the structure and URL analysis point to a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://robert-zauer.cz/userfiles/file/wimivosojeboj.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/jemujabagobebiwagixazasor.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160746adde7fab---xemijagof.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/kikujilagirij.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/xoxexesobazelojevobejot.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-10/20210510124827895085.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d9d747d9a---9272378707.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607788d201947---80393152989.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3d95213085fc9068ba6efa245f5cb7ea/fumabekovetukawazizaf.pdfIn PDF document text
    • https://estoniapools.com/contents//files/69745426220.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/38753724064.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/42187500252.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9ef587e8---kamal.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/69263397337.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lozugubupamademenavit.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210722131955.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b603f1bbea---luxabaku.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/nulirijimef.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e5d5f27fa96896147167d89caf763517/kabig.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec651076a---fuzorotuxapasovizajafisok.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/e32ebdefb550fe15365fc02977120f4a/tezefabeb.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc0ba6f7a---zevonexixekaganojeli.pdfIn PDF document text
    • http://www.asslar.de/downloads/53140205297.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/rofanimonenejufawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+disable+lid+lock+on+kenmore+washerPDF 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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10944 bytes
SHA-256: 5c9c2f91fe0c88e290a668a18a6d5e95d1be335cc385ae5df3ec4da330c5f457
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 16732 bytes
SHA-256: 65a150624445105ca898ba3c41752acf877e692c9e210461a43a450c4e43cf9a
font_02_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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