Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3371b6fd6d65e1f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 07:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30f3fba5b17873eb4036c9c9960e525c SHA-1: ebeedf6bdae36aa9e57e87c95dbfe7acb36e2702 SHA-256: d3371b6fd6d65e1f0afd78e499035714a1f314235811d8bb88aaf5f18a546468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=gtr+2+fia+gt+racing+game+system+requirements PDF link annotation
    • http://logtech.cz/foto/Image/file/84985226465.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/99425334437.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9faebd244---saxukiporomofalileta.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/mujovuniwi.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bapikusagukawelu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vquefk0tfmfchqn4h3vi4pulu0/zafajelin.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/segubijovesubaw.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/47540894816.pdfIn PDF document text
    • http://dytac.hk/userfiles/65405906653.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/falisade.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/gatasawazaxamewe.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/57572967696.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/samazerifajasamuf.pdfIn PDF document text
    • http://ruihuitax.com/files/file/20871860422.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f2a8aa8de6a0d343aedf9dd3df5dfc52/22833590835.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/24656487740.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b25e1f6af---wakowijadaforevonefukob.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4a34c97bca35053261d1c694406cb537/minofo.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/niburobuzagujatagutezu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142234027461---50419975291.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/jiberomov.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/58541718537.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/20099206856.pdfIn PDF document text
    • http://metallpress.info/files/daguwipewinak.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/kuxozox.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/repafaninarivekiso.pdfIn PDF document text
    • http://hotechike.com/files/files/10010045781.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161420b5071a06---27178047750.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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 11032 bytes
SHA-256: 2ee83f01e21671bb8a94c62bc025763ab7dda85d3fbd6b4d2ef5c0de7d4cbf72
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 19320 bytes
SHA-256: 9b8e73113dbb72226ab82fe729930f458ee9c76de75d120520c3df5412adf32b

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