Malicious PDF — malware analysis report

Static analysis result for SHA-256 5153fad319648e17…

MALICIOUS

PDF

81.0 KB Created: 2021-08-18 06:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05ff50f6d998b21f4c8a8d0d15a73015 SHA-1: 9a3619bc52b4ff2048fb70c2fb466335fcdb4e26 SHA-256: 5153fad319648e1714a8de73043baa2bf76bb9fc8316a8a9ed07ae71d9b2b41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/732d71e1c286717260d0c0697399979c/88640077828.pdf In PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/55882230144.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/pikow.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/wediwevudilifowoge.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/93114782574.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rafuvawobuvumukafil.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/5434745597.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2jm1pmurj76rttuk2mqt04a2dm/wegobojepipopoxo.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/72076892282.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/kuvon.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fodutodokutunutetowarul.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/80420140656.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/39493217125.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607661d687758---61584797800.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/14091556999.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/nuxunuliposod.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///92132557845.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/1955844164.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55d86d8e4---koxopikebifabuzada.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f9d9c99f---pojexojazewevobuxemaxos.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/86043886118.pdfIn PDF document text
    • https://zhansq.cn/upload/file/liziferebemosama.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b60be34d66e---relulutedusokasenadapi.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5903_20210717144311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+oyun+club+gangster+vegas+4PDF 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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 18924 bytes
SHA-256: c9a3e0303ee4edb4c8287d8c24161892a6b37fb3eede29d3480fc9f5a507ce4a
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 11024 bytes
SHA-256: 2286caabb8c172d1b8c18eb47a01b263d3c537980f35a24612c32670f273a941
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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