Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ff8d2b868edc0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 16:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d05704c4d50aaa85af4880afef913101 SHA-1: 7657edaec7e1cddbc7176f2ed4eb64a77b9908ae SHA-256: fa5ff8d2b868edc0a59a8584d2c9b5efdea0329bc36bf1e68a9d7e5d693a98aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of multiple external URI heuristics further support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://slhs1958.com/clients/18590/File/jalisax.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/jizanixisu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e53e7bf6ab82860df31073010bd0f9ea/98251951830.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/8122315241.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4077fb3cdb---81925325721.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/pixewodux.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/24d01975521c35cf19684865320955aa/27225435772.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/23fb2818bdc1a923330f6fdede9756de/kuvefis.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/25740654748.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bej9o53bulrpjkf0mb5vcrnv6g/95389434972.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/jowub.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/46945328684.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/77834218968.pdfIn PDF document text
    • https://vientangluc.com/upload/files/12132981302.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/17642094954.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/putilafidam.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085de2ae5785---kifinirufuleb.pdfIn PDF document text
    • http://cssh.es/img/file/worodunude.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/iromokc8sus74tqr24lmgb2rit/wuwobu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608af41aaa62b---50526261556.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c595ae4---37285546669.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/butejili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=articles+of+confederation+analysis+worksheet+answersPDF 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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 10844 bytes
SHA-256: 9839ebb4ca1d19c4b3a0b66d14a6e4f7c7c901ac84a8d13f1c65e8f80dcc5db9
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 17800 bytes
SHA-256: 31026741116ecc9202cefb21a633103d7506968d27e386679f654f6199a35819
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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