Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c2461f3d3f6642…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 05:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 850043389baf7d05fd1967baac7206cb SHA-1: a875bc1ff5268a9578950484d1b8d1d3f412d4c5 SHA-256: d8c2461f3d3f664285493d5c0ef09d18f78b0af9e9a7c45e0269ae03b8a7c029
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malware or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pcccphucvinh.com/upload/files/19273363567.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a300773ee4---koxoxomezu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/64340181168.pdfIn PDF document text
    • http://punaide.com/userfiles/files/kefisawuburubod.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/tozirufoginevokanu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1cf688db---vikixibedap.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/93392710978.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133484082f2e---67993132753.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/80086417852.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/86476056173.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/9225825606.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/fafoveduzowelikula.pdfIn PDF document text
    • http://anm-av.de/uploads/files/60285586087.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/dobejefobapojisufukifaf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a3fd40ed---37149623662.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/bedapefifujexesow.pdfIn PDF document text
    • https://fobh.net/userfiles/files/45584266850.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/50424654545.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/34882145212.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fegizajifojilobi.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/27727890700.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/51621542983.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3921af0e649762b40d1806ab460fa9af/95595389494.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/75928752300.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/fugotifagamusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=marjaavaan+full+movie+mp4+download+pagalworldPDF 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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 11028 bytes
SHA-256: bfbdaf098e3192e1bc58b6b093f331f006edac0ba4615f1f158995efebb3c88c
font_02_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 17804 bytes
SHA-256: 7d8f44246dbd3007917ef2eef6f601b30918c73b57a887a76abbe668e1741c93

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