Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22fbb45d5bfd816…

MALICIOUS

PDF

101.7 KB Created: 2021-09-07 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef721ff1cf22df95a2aef2f564c1a170 SHA-1: f83473baa8848e17fdea7633d0553a9e4c0d5237 SHA-256: f22fbb45d5bfd816303e9f3c08674c4ecb66a1a3ecd19fa339027e78c1a05791
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://semineebrasov.ro/printuri-fi/files/fomubikukisebuxo.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/pedonuvubozuxofi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c69496512---xezilezevixu.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/cf2754871559b7d7a96ff820aaaa2205/fenizowemefefazegob.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/68731919591.pdfIn PDF document text
    • https://e-midas.ro/files/file/vusorarek.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e1eee82f42472da5b4245431e7ce4063/zobexasefad.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/92356608352.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbebdc13bb---linidumogotomure.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/lebukajogapa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d182eb5---vejizusuvuseruketit.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f40ba5f667---gejoriviganumeja.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607387528aabf---12768307039.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/jipunotegugadegos.pdfIn PDF document text
    • http://elm3rad.com/file/72782476545.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/22985582559.pdfIn PDF document text
    • https://abstractcomplexx.com/wp-content/plugins/super-forms/uploads/php/files/e51e1bf10b69ccadd743405b830abddd/80552187026.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f4a1b4fa---39965819558.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8efe9948---54536518589.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5f2073ff9---jubogokokibige.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/63709065016.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5medcc85f8pflvdumkln0kuh3d/sonifiwu.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1o45n1uut773e5s6avur6v11j1/21069789272.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/tusuj.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/rifuputijilozesatuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=romance+ursula+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_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10736 bytes
SHA-256: cdedbd6a251417a449423855c6443c67883b62f7a6cd8493c5451f872c5b4448
font_01_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D0 21980 bytes
SHA-256: c035f5268c1ce45b391d0517a7f6c17fcb4a07bd94459e31d24cc5fdd5762aeb

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