Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc13c0d072e0343…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 22:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c7d1866bd1b5b7bb31bb27d3aa6fb19 SHA-1: 12edc4511a7ac82f5dc5d28fa68da17c0e2eb2aa SHA-256: 4fc13c0d072e03435d5b7d9831cf74d54d8d9aad0932e24e2cc5c8d3a3eb0e55
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the true malicious destination. The primary lure appears to be related to PDF conversion tools, likely a pretext for delivering a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613550b2c575d---30289432825.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/72e96d537b4a61a0c31c9dc2e8a23ab2/zusuwowipuzelubi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/80899478189.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6394a2df---valoxaxibaruna.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/dopolexigezepirozagemep.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5fcfe9ec41c53b45706e31b4d99342c2/bezofisodapizere.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c2d69810---9164679033.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630542123.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/gizefisafulewesesok.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/76043232332.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/70223638841.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/40c937b49e06be7980e5e3efb6583187/79440426908.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/70500134100.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f3e0b577---3469253520.pdfIn PDF document text
    • http://soles2walk.cz/data/file/morut.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/43806804385.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/vopugofazupapanes.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/67515cb50edec03d21fcadc266f28d43/18339695483.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c5f3bd8968babb39a00004178ba251ce/10270918443.pdfIn PDF document text
    • https://taperagi.com/contents//files/tekagonaga.pdfIn PDF document text
    • http://ktcz.eu/files/files/bisege.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aea8be78e---19292251336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sldasm+to+pdf+converter+onlinePDF 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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 10924 bytes
SHA-256: 03ffa07b4f2df20b045d74af249958fce7421781e04e7d327ee83b21e7d944f5
font_02_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16420 bytes
SHA-256: 779df8d3cee14b4ae741db2038bdd51e52fd6a9a8eb8307dd3842f521d48bab0

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