Malicious PDF — malware analysis report

Static analysis result for SHA-256 d449cc35c0b3195d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 13:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8986a051a76a6dbc76d0011022d40a63 SHA-1: 8505dd176bac92f0642ce091be8c3257a3a6f88a SHA-256: d449cc35c0b3195dd5edc174b5aaf28d8d059e11a052df7d1ff2415abc48f782
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=good+play+store+games PDF link annotation
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/noxekax.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/60816889836.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/34140108653.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/jedum.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/volefifusebifo.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/liwotozubimamawifoboten.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dfe289df---diguluramevaralasavomol.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xuvedenufa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b4c41b3d0b8afe0c87a0776b9e2d60fd/85308953851.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zanodowut.pdfIn PDF document text
    • https://fishboat.hr/files/97599377490.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/26345678857.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/29141830130.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/dogun.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/48561815755.pdfIn PDF document text
    • https://atiksigorta.com/files/70916850845.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/88374317740.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/rekugaboton.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/10473899639.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/ponefozorudimur.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kivez.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3jiprje203qudc5t6l3e2mid15/bivikuxepakosig.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10c4b1426---14759443476.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/95883914377.pdfIn PDF document text
    • http://elpijisystem.com/file/45531368293.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 15752 bytes
SHA-256: ad7c7fbafb65733883ac020790d2796c5987421c6da1bcf4ac73ee244df02879
font_01_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 10692 bytes
SHA-256: 96e050b6f1714f6dcfff7802ad36ac3019862ee15e1f0861a292d527df9cd915
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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