Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee55156550f7e275…

MALICIOUS

PDF

105.3 KB Created: 2021-06-30 03:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c467a4b385cf468c639a2ee5db4a29e SHA-1: 43026b685b2a66d58d50594bc772936d029c33e1 SHA-256: ee55156550f7e275209e92c79ed55ee166ba72b39f071ca63877e25d7ab389b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and a link farm structure indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sity-luxe.ru/userfiles/file/69188487239.pdf In PDF document text
    • http://quickvideo.nl/userfiles/file/gaweva.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/i7lo2go885gschoqis8oh23p9s/velojokezuzerekuko.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a8e4b631---55271486027.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3314abc883edc80fcb610ea203a0689d/66722355964.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gakisekuna.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c440cf037b68390d164db95369513d04/wetoxivebegavizuvif.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f26357adc0cd36356cfb002310aa316c/90008061100.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/sesopuwo.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/71026140446.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a47deccdba6d4068cf6c9cccd82a3b2b/zijivem.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a17f3123---veresopufedijopaxurapub.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b79dc8a28---83452854025.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35422637b---94911246067.pdfIn PDF document text
    • https://bursac.net/userfiles/file/71725181356.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3ae4435abfde5f3e5637014f0e7d0871/53432093991.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nuxewigupajopesoraseg.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/94396385261.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/sadusorasefujemigidexalin.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2e96e65798d69af1625c14d13108f220/kiruzidoxotelazobetu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0dc2a036---xalimi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772a32cf51d---39861043092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=forebode+meaning+in+bengaliPDF 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_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16076 bytes
SHA-256: 5dd1dca8bb58d90207c122dccc46196cfcc981145e11389ee8d751c37cccba71
font_01_sfnt_off0001669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669D 10444 bytes
SHA-256: f2d3472ed26b34c8c23d5efbb2f2986ba1e296d8ff3d78304f479bc4ff4207be
font_02_sfnt_off00017def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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