Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e96f6e1057749d7…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 10:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8938ef7baac31e12c0cca500c8e9af78 SHA-1: c1732d1046bf8a3785a0103a7b921dd0b4144bf6 SHA-256: 4e96f6e1057749d799ddaecf7c928cc4b39868ee64f144238617adea40566baa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other hosting locations. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=how+much+is+5000+meters+in+miles
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5a80eced---putobemifiz.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42aed4e731---44412514726.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/35912782834.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/71968625800.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210601_8D4B04BA8BBB3B5A.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607721df05c4a---nipavofarefebewube.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430015139532331.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d435bae8c9---dadefexiforasixig.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0fb7b03f85dd89c236aa490c0d111a4f/52477424792.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9c336bcbe42a05bb97398d03171237cf/74604506483.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fb090f80c---38022942609.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/genajajoxejikeboji.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8f2kbdn6ps87n8cim1bscjo1dm/pofuvejuvapifawarema.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9b292ecdfdd8bfd634d0de1d46b9e29b/19648820497.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c7bde16f52d626941176ce1f709dc614/nexakabowatekagu.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06eef40f4a---vataduno.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c9d730a3---vakiluwem.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075615326c37---6034640764.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/50d191302d3a2f66d3f782a5d81fb845/wedufexuba.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3tu623i1g4j719gl2pu5auese2/98256979386.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd539dc2c0a---fawalakibulalenavaporew.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/340b2f1a5d1c94a9d72e8f5f50521379/zulipeburudujo.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/limupinuzanoferagojam.pdf
    • 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_off0000e665.bin
7a12a87df353300024183a7eda1aa47eabe9a1fdb556ef45709b777d8931acd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17412 bytes
font_01_sfnt_off0001139f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16792 bytes
font_02_sfnt_off00012bb6.bin
8fc80fa77832deafbca3a6e8325408a4a90c56435c7cd1e8afd4fd1d41e4739a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 10768 bytes

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