Malicious PDF — malware analysis report

Static analysis result for SHA-256 d131dd5d6962ac6c…

MALICIOUS

PDF

108.5 KB Created: 2021-08-20 15:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f07ba5dc315f01b08832ef0feb587fc SHA-1: bb9a6124bb69da708dcc33505f96a1a228880008 SHA-256: d131dd5d6962ac6c06498ee962e642d15e3ab486b2d9352b453364953ea71e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0718389fa1---63176428200.pdf In PDF document text
    • https://anthonygillant.com/userfiles/file/valovapazu.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///47878134040.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/81819231991.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/bifogopubisigojefowevos.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/19677987733.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/eijjpl856tfjvp6c18crr8nq6d/60441212970.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91e6b6656---36616000621.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df6f5609237---nixixitel.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tajudawumo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5bd57f94c1b0cacd36a318e3f8a6179d/figuluxipinekipatavija.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/65509083222.pdfIn PDF document text
    • http://newmob.it/userfiles/files/55981837237.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/winugusabepepep.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9d1ca7c806af72a832333772dc04fe56/jedajametose.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wusewewirevamizena.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/55758363671.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bf58ea3f17b727e5a5157b2d982dc318/55212703622.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/68c6de54855222cd3389d0cb147ca112/12000838382.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/7621713158.pdfIn PDF document text
    • http://svx.su/ffile/file/degazelekibesizot.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c69d44ba---49654190846.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/70511601722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+juegos+de+xbox+clasico+en+espa%C3%B1olPDF 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_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 18144 bytes
SHA-256: a1dcb7397e776968b15b63fff9a7d73a302c3c5dee83faa99cc10cae9cb1c820
font_01_sfnt_off00016f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6C 11272 bytes
SHA-256: bfb8907fa504d929b7c2a5867109fa105cba0d0933e2f52379675e4cdebd5398
font_02_sfnt_off0001894a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1