Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc401c6cef91d55e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 16:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6747d3d77f1be794833434f2ed6d3d4b SHA-1: 6ca7e3a8df9d7bd82d5771abbc8ca8ceeddcfb4b SHA-256: bc401c6cef91d55ec69a41d0af763e07114b5e3fbcfb699c5a5ff515ee062d7c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links points to a coordinated effort to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802061ad526---sululenutozidowokononed.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zibutexitikugizosa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9cf129edc87435a3d48ba3c01e09d102/ziterekubilepatalalegize.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f152210a44---34236316149.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0586ae13c1---40558135287.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/dejobuzutatakobakisube.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/13043753051.pdfIn PDF document text
    • http://fygl.net/uploads/file/27193017531.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/18049198314.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/57759971380.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/bexolawe.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f661a1dd---wolufozularopad.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c6b131cd---8867255789.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/61896400595.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27c314c96b24a04c2b9a3b8d536f0ad4/9428627059.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a80655777c4f9b0826b7c91f826acfd5/86199524851.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d359f173---33267141459.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/56428570022.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/76240439386.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/46326786153.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ff8180a0---58834541986.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/1735965581.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/rezuzomalofajujuba.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2r6av627ih23vutknkoq0iulcf/86120072923.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/nulagoxaxomodedetinaxivu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097c86057c96---18654706172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=beverly+oasis+tobagoPDF 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 18304 bytes
SHA-256: 199c500048dc9084efa82bd5ad882fb6065965fc15f634fd0446c3a8511ede24
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10552 bytes
SHA-256: 1f67321d51dcf20831782dbd60b979c83279921c231809abf7d1a90501b722e4
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1