Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fdbccc2942962c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 20:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4fefe2ea16ca59b5350df74fb632e26 SHA-1: 7fb76e99ebf429792e48926eb7283c1573e022c9 SHA-256: 84fdbccc2942962cfd906c0daa4b4360672ab20ef5287a2549613153c404f16b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting. This structure suggests the document is designed to act as a link farm, potentially leading users to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=types+of+cameras+for+photography+pdf PDF link annotation
    • http://slhs1958.com/clients/18590/File/pifebi.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/46612654796.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/32443639115.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083c328e5fb5---44344804153.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/kowilixufafelatufiwuso.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9a2275f95b6ff366d293129e95e025a9/7903422964.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jivobj06dajh4poqroqthkir2i/livobaxufelofewisero.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3134a4f4bd---lotudatukex.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/timal.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160925777c2fb8---85366203905.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kunetewimovavugurenaxuni.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d37ba930f---91527051781.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/86932422319.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/jorumaduboziwekadojogopo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac19886f2---74768482306.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ab6527f8---tefofeme.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/gugasexiziroxexuvuvatuf.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/xetasavakove.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/948cs4v64q694n0fa45ktq4j9j/figowinoxividogeruwukeza.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f201ad654b---52289272217.pdfIn PDF document text
    • https://wonkingchina.com/d/files/2915246595.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/54424908696.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/27886203879.pdfIn PDF document text
    • 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 17644 bytes
SHA-256: 28db72c81e1d31409b401d67301165580b47884e12bbdb11c44fd63803a2aee9
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10900 bytes
SHA-256: 60688e3d55d0c04b8f3418bc981f3f79cf4f9e3ac43df8d826d52f4ad7f8a36d
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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