Malicious PDF — malware analysis report

Static analysis result for SHA-256 b239b9d5a81c3a4d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 08:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a237a9f740102f79ee7f49663339a44 SHA-1: 77efc15d4a042c4bfba6305b328b9077fef3f380 SHA-256: b239b9d5a81c3a4d564e87b38929b0d6dd91d4f2cc7a08618de775174da4636e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=regalos+originales+pareja+manualidades PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af90b38c02d---rekisivu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bf3ca29ad6b65af5c0cc14aed3e0c1ba/43138612697.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168b402367---reruvumegisivukeganasopi.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zozutajelotowamofaweziw.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126167dd3945---kiwonabobopolugolor.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/16248391412.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/58057966131.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/80997762236.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/besinibupobilaso.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/84271578505.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37f9f0572---fapovalenedidafejo.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/jelobixixurugig.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f380c2aac---rexumoviwepetu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/99417160040.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/10368923012.pdfIn PDF document text
    • http://nature-revive.org/files/file/74324624650.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a5664ac66d31c85eeacd7315207da1f4/borofejegizinowa.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/73199165146.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53599654928.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lazozanafutikobamifofene.pdfIn PDF document text
    • https://bak.vn/upload/files/mumoxetolakom.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c24f01d72b6---93387734922.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/legewuloriroroduza.pdfIn PDF document text
    • https://digireg.ch/upload/81269844221.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121c0cfad29d---pekovobikifoni.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vavodulovibulorovaf.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1af8d7d9e---pijafirodamo.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 19680 bytes
SHA-256: 4c1d7eea8b6bb34e726e0f58d37eb454346dc839c9da766f104c91f272e677c0
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 10912 bytes
SHA-256: 045c0fa2fc78ccf86fd1d2bc715e438238e383058042474f924191c287324783