Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd877449ec032212…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 03:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60e0886a6174c4e24cf90210fa972a80 SHA-1: 0c1e93974122ed3b094ca64499d6a4c8f3f80003 SHA-256: dd877449ec0322129e367092922a2c19efe66d034803461413b494ea52e9ace0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the true destination of the links.

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.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140aecbbcbcf---28662946780.pdf In PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/15946104333.pdfIn PDF document text
    • http://muszempilla.com/files/file/84922061012.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36f891807---68729955324.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/78473905697.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99687187366.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/32352389081.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/17140088560.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210919_EEE0FD6C29583087.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxomupasuniregofofolixo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac898376f8---sidikotide.pdfIn PDF document text
    • http://napiarsaigh.com/images/tabegikerefojawikujofa.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/jukaw.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mabajomaw.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/kezerusonenobeban.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/nawun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cdbd0195d---74518180232.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/27772129049.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/32459503059.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/2407880308.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/76666115417.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a22a1acc7cb87a009fae51df9eb83234/47548746003.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luwuropoxi.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/69709642147.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rasenizojojusaledeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=indian+android+mobile+companiesPDF 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10668 bytes
SHA-256: 47e8f27e933b593f4484abcf28e08ed86d37d150ed982d5bb850f092979a1482
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 17388 bytes
SHA-256: 54d8db31de002befcbda1dcb8ffc3d5d30fbcd50da7cf1955994ec6a970127af

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