Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd99a5fb8dd1b8dd…

MALICIOUS

PDF

89.6 KB Created: 2021-07-22 06:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d514d43469e8a0e82bb6ab598c195dac SHA-1: b5f9eab6db188e179353878b6e28687cc43aa560 SHA-256: bd99a5fb8dd1b8dd32789c9ab18bfd85108a2e51923620f69a024a27bb9424e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector is user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e7215a5d---95070962079.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc99626fb17---95806646603.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63135308710.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/43856721934.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/95613442295.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/cead5864192c071daa7ba55ad91245ae/laparopasot.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v0paeb8t049rru0idv28umvosd/76238390544.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fowifinema.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/8567129061.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa63f7e107---20035436264.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/menufozofatimarejosizujo.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/7c7149bfecc4abd6f597c491eb23f362/47743722212.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/61126849306.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd29dd260d---13660120529.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fd76207f03fd490bb0af3ae5ef253dc2/13771276916.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230590216e---nasubugixagigobere.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/44433841902.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8930bdaa---43771028913.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/podusudutabepolenojibu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6fa5e93e2e7374f2a70d105d18babc0e/ruzuro.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/89978658909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=probability+and+statistical+inference+pdfPDF 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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 17776 bytes
SHA-256: d41ff5283fbbed345f370ccf92c8dc69379b5d9a1c2a00a81a902ef9f9f1a93a
font_01_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 10868 bytes
SHA-256: 49ca58d47d3775e4fede5bdc722f47847d6e678266693ecc9d5a16d2b7673db0
font_02_sfnt_off000140d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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