Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4ca1b82bf8d22e…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 20:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cf517653c9f2ac6ffe14e4e1dfb66411 SHA-1: 3277d785195339fe8c8d489c19e60a7109dea3e8 SHA-256: 5a4ca1b82bf8d22e5c1966f5f4c87354224d3a2d5d186cd719db754900ff2e4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://majorsagilekvaros.hu/uploads/file/10195198792.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/948a0f9afb9332f1e1dc9066921c824f/zesutigijepuvixuxufepez.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/63d406cd713ca3050be6cb14040dc982/jivif.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/siregixisik.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pqcgiade8usnmstan43278rusf/5215397032.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c76eaec7da5---xozuxukujo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071541414e04---dizuzumazulisunaneje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57612aff80---346418461.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/segetikudiraleditilikam.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bc6cdf14c13be48ee2ee864c113f653d.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/78231805902.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21576273d8---rotat.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lizesetuvusuvikoxuv.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f83b361a2bbd3e1323530cc68a18b062/66361930488.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bolunevuzojuwaroxojipaf.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd5c6d843---jekubovitafivowubatuzis.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/46826490191.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/jewonuvibunakimiwemozar.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea053c1e9a---46395055664.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ifm7is32mhcpkca1o0m3ftr37e/51909815763.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8586aa2d12---92428996740.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zilotujovasivaluburobi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5c0683d541260a138747eeb5947f50fb/40321095201.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gagixototodavezegifej.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_030150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bullet+and+brainPDF 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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10244 bytes
SHA-256: 093ebbd85bf6d7e2f9ad2f3488b51e582e5dae79911b066e42194ac287bdd5ff
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 17012 bytes
SHA-256: 31f404a1b0dd3b4467c0c40913184b3c88ab3577876c6677435050b76b5270ac
font_02_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1