Malicious PDF — malware analysis report

Static analysis result for SHA-256 df14838cb1a6e3d1…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 18:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48994ad0fc6239ade737eebe403ee829 SHA-1: 568247b4996238fd7a728cc4850d818765c13106 SHA-256: df14838cb1a6e3d10cfb00567f799369e6e86fae8c628d85f5f376f02d9b99f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/99ca91d5459e90b5091f388243399c63/nugorug.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaab055da8---23056472802.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9rdt3tmhue4c3eog2kd995s9s7/83600751484.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4cdc642e29918d3bb647a9823e220b1b/25712757473.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070116c29400---vutogiwofurafizonavofali.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/37821021294.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f48b3191c218df017fbb80b938d3a5e/dixusarelogusivatidamo.pdf
    • http://dzbnf.com/upload/file///47680453192.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe134e01d---jewazakanejevazemaxifo.pdf
    • http://status-go.net/gfx/userfiles/files/lavilipepararuzaruroje.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/801cbbd10bcb1094b7c8c02a014808b3/kuvekukosoxesekutatuburud.pdf
    • http://turnyras.lt/Files/file/53524195276.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607996e879203---nitomavukifapojeloluso.pdf
    • https://mecaniquekd.ca/upload/file/busikelof.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4fb532452088aa8b7d1d0a98d23495a3/dukavowadurupifabop.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/af70c217142d7691b6ef462f9d46dd76/sutizojetepukejineba.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607980d898084---345117538.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837a1895ae4---zuxowulunuzibifa.pdf
    • https://drvishweshwari.in/userfiles/file/70582287755.pdf
    • http://verypool.cn/images/upload/File/31300624214.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38a3d453f---68205100179.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751463d419d---xekidatimadibejemer.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ed39379c---63537831385.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3c5ae367---xedujodotijutarimaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=double+entry+bookkeeping+class+11+pdf+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e475.bin
f4bd46fe3c7ddaca68dc3bf22dd306a46c9ef9979980f03229234021a25e553d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 17628 bytes
font_01_sfnt_off00011218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
font_02_sfnt_off00012a2f.bin
53e9993768ed59153f167c645806f59d03a5a7895b8b4adc533d19b53645753a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 11536 bytes