Malicious PDF — malware analysis report

Static analysis result for SHA-256 0203e6c52ba605cf…

MALICIOUS

PDF

140.8 KB Created: 2021-07-12 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a0ecfc055173bd7bf06066f678da2b3 SHA-1: 341e1dfc668910a56cd753a171bf2de0bcdfeced SHA-256: 0203e6c52ba605cf22881f1843b8e224c9e2de3db25e396f36578a624e5927e9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4eletll1u605e310j5i64m5l0j/31244345.pdf In PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/volubojuzigig.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2bde2e446ad71dda4179e16872744bb6/pinufugepiti.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cedaeb635---26751022150.pdfIn PDF document text
    • http://wenxuezj.com/images/File/48107269342.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/16083087314.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/89196501851.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0581acedc8---10127493454.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/lodubexikulekimub.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/37fa77f1ae6e98bc0329a8399513e2a9/2367214879.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47089152688.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/josivolatipofamomefofel.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kejalipogezagalizadaxiwew.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/56214584413.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93808073732.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/be1baa744ed0cb82023e3322da93d840/57729074051.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8c48ca85773a3f7b2351e8ac997a618/77568378567.pdfIn PDF document text
    • http://ubest.ru/images/file/40662980786.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bbsfh0gpap7l0fccmmj7503q91/13381713536.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k01jva2k4jvalpe0e1j6v54t88/77314975508.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8332f065ce---49646872412.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f12b3bdb0a181409ebad3cb979cb7c8e/70390503908.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/17268192487.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/83933588443.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ade4544ef5a---6509750846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=upheld+meaning+in+lawPDF 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_off0001c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5DC 17748 bytes
SHA-256: f944fddd256444d1de5885fe76c1141a514a3cb9358d6cffc4dc94ed01bb74bd
font_01_sfnt_off0001f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4CC 10448 bytes
SHA-256: 3ab9b8719ca026a46518222b55836e872718941a67829167d6afd498ec3dae60
font_02_sfnt_off00020c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1