Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3823e3d0396dab2…

MALICIOUS

PDF

85.3 KB Created: 2021-08-04 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3234ca2d34f1aa2359fd30b16c4cb3a SHA-1: 200bc38d665f7099d8b0d29f43fa6d88aeec0e6c SHA-256: b3823e3d0396dab2372ecd41e2db4d70971e7a6123c43c267dca8448d4d89f00
156 Risk Score

Malware Insights

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

The PDF file 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 distribute malicious content or phish for credentials. The presence of numerous unknown URLs, many hosted on compromised CMS platforms, indicates a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b4b210f---weponokivifedufupazemafu.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8t9n01cr7pi5cvqcia5l2lpq60/pevewilelejobam.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/loxafaku.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/92625435402.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/35492390230.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59b540795---54639117190.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/56309664495.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/melunavibuseg.pdfIn PDF document text
    • http://armanetti.com/images/1174477559.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/12248248342.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/550d27881cb1e5fb90c640069b42dbec/27716792726.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/32401350803.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/lolapaf.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nukirosixejerataji.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160737584a38d5---molebisopaf.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/41951a1e41d772478e01b15ae25fb6b1/jafukisaner.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/dadorujo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kajipida.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/97918bc561b93512ae27f06b5d921e70/nexaxafotive.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vogadoxuloforejoleroxogis.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/paxisugurur.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/1059698796.pdfIn PDF document text
    • http://capital96.com/userfiles/file/41901792625.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/mukoxalumibaf.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/48337511983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=profit+and+loss+statement+template+for+nonprofitPDF 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_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 17300 bytes
SHA-256: f08ea87588315172e9b7e3faecabe5f8bc99b20a8a474233833a1e51a83865b1
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 10660 bytes
SHA-256: 156f6984517563a597aa666b59731bcb49d1dc903bc1a0ca4ad4949da6ebaae4

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