Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97acc58a08d4bd7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 13:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df07d2c556543f81ad95838b30b04550 SHA-1: 9d042d4eac1a700aef6b6c74b6fc82a09206fddf SHA-256: f97acc58a08d4bd7cc452da5e9e50d8b36e9fadca4caea860baba63069cd2b1f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. The presence of these links suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da9d4844d96---39688309584.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9686330a9d50c690174f80dbdf42426c/49643362349.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06ce13b137886d9643a02c883b6a3985/gepewege.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/mowosesozorevisow.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7b7af9a5f6c99f4f25abf69ab6b48a22/26846644228.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/bivamul.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jewuvaxugoxesi.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5ail0ug4fob4ihe0fa3ool2q74/69556435407.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/46549808208.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5e4d37ae73e89408b1fb18f0f973efd4/6306512244.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jigakobinamebat.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786554e5a85---97966760301.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e9175a5932ccb9de36898257967519db/52454798810.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/88502655474.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/79168311909.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/lezujavapufo.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/49193187840.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/pozadexesururonovo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/41224793295.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/gewemulowuga.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bazeleg.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d8b40fea5---32357047238.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca06919fb---75315538907.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/wuzaz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cd3aa7ac2ae35daf17e1b9b39346886/wufutewidebivarenasiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=le+condensateur+pdfPDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 10532 bytes
SHA-256: cabb653556b06371a5c524b47dd6fef3c37c3091376259b80cbf8f3bc1dccdfe
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 15968 bytes
SHA-256: ecf488b7fe0e3b088c225e3bb1e05846e9a80f74238e636946375ddab6d74862
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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