Malicious PDF — malware analysis report

Static analysis result for SHA-256 2317c9e5379dcbc4…

MALICIOUS

PDF

77.9 KB Created: 2021-08-29 15:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4aa1c902a10f8c42643fed8ad5c428f5 SHA-1: d3986763c59a483982055ceb15e86c704e01245f SHA-256: 2317c9e5379dcbc47d609d18d9450104f770e611e15c4d649d31d6404693c109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites likely used to host malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious destinations, potentially for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161290d3db3bee---xopijeduxulugo.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b0aebb8fb15c1d4ddbc31dd290f5e4e5/42471546007.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/96812264838.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pirox.pdfIn PDF document text
    • http://christopherdallo.com/file/dabusipefulo.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/88714259074.pdfIn PDF document text
    • https://majubesar.org/contents/files/telazi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210812014843.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zinujopudesod.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/88365634584.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd103b00f7---49215821123.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16117d690007f0---vurokapaguta.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d03dd379845---26238379594.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a2502406---zirogexadixinaro.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e287ebdf8---57903794289.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/25444172860.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/tokutolibetib.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/84005313896.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114d21f70f1a---35976481804.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/buluzina.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wapovobimider.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210813_002109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+avengers+facePDF 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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 16924 bytes
SHA-256: c7ed30409bab54c7234bb61ed5339c50e5b28407360b57f96c2205378e8bd56f
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10656 bytes
SHA-256: 181a367d964c27850ae630cbdaec6b083ec632ba3dfc9ce41ea714d0de015dc5
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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