Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a24c0b501e541c8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 21:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: add65438e4bfa738bbe23ceecee880c3 SHA-1: 7b1e33b92b0f23eb010eda22e11c134d209c7911 SHA-256: 0a24c0b501e541c8e4e5cc95f53afd6202b6ddd83235f5a0b170b9c70685ceef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=alphabet+worksheets+for+nursery PDF link annotation
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7c86964fa40a04df5dcaaaffd132d8a1/rebilukakunagofop.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3leqab0itfl0r45qd0jfm9qh70/75385693010.pdfIn PDF document text
    • http://gerocuki.hu/user/file/73282201961.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/snt7u9pmn0gee17r8ej5vouet2/71284710751.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/41232703904.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/dalexobi.pdfIn PDF document text
    • http://erex.hu/upload/file/suvozatejulagobuw.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_FDEF5E0643DC9B9C.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ca3c5a86c---wojiwanosuzo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a38803750d0---31632527368.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/45e9c784ee70a41d373c80f6431f4be0/tonogidugezimagiruranosa.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/vefevozofikutax.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/kabiwor.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fml43k93hak6ensu1k6psqah65/12156416747.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/2d27b1ee799d06cae5d1cd911db3933b/2891541289.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/64504778721.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3badd9a7---jilowosifuniligowavimof.pdfIn PDF document text
    • http://maidichike.com/upload/files/48911184384.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zuwuvupipexumowir.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bb7b46b8---nixolurewinidalafa.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/53ed803c289ae6402bf8658299076a66/zigojesenusemareb.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/mabotikazaxisaxexigizat.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/ragubesurawug.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16420 bytes
SHA-256: 48e889fc55aa57605119b8532e9a1a3fe2bf0e7a8269e7afb02cb94bce0bc67b
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 10876 bytes
SHA-256: 7eeb3d45c6f6bb6125f21c4ac0599349d23a4df79837bde0543c7d886bc2ca84

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