Malicious PDF — malware analysis report

Static analysis result for SHA-256 524fbfa6d952920e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 05:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea91d590836c2655ab6b1bb1bd0b6b54 SHA-1: 3ae220baaf643d4a3e20ec4383f526585952698b SHA-256: 524fbfa6d952920e734b39a2e3e2d4075ef37bafb3c5f45c271ed5dda2baad97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chingyi.tw/userfiles/files/sanebevofipuzox.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3e5f0a273a0711feceb6a6f04bd40c30/jusiwupulesovodetanuv.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/77867857737.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/82835315383.pdfIn PDF document text
    • http://beiks.info/public/file/durulelumo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b841334f01c30e445f476f25d7dcf0c4/89672664485.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90e3313d4---6390510321.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876276617.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jt49vcmitpb7kqg0dbc0p8a2ld/89829626558.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/neguzepapakijogikodimuve.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/90214732035.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/84918418920.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/94186220764.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216251719531011.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/tazubunudaredibawi.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46065912898.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/ladogiku.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/90060351886.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/xugajuxu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb0e0a7705---dejopok.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/kijibolupilinisajobi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/duvope.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/13772723199.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sapusazu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tevijubenawanebusamarebiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oh+my+god+please+help+me+knee+deep+in+the+riverPDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 17204 bytes
SHA-256: 0615b0acbafa10ef18f9e95e3ef11fdd4caff1d70098bdb1994df16078c3f65f
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 11136 bytes
SHA-256: 3e81bf85e9ae82dce3186d61b7286a232cd6d61ba4d619432294112cad88b774
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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