Malicious PDF — malware analysis report

Static analysis result for SHA-256 5313c938b8ed4014…

MALICIOUS

PDF

92.1 KB Created: 2021-07-25 14:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 151ba2d792c8dc3b2d3b82860903d1cb SHA-1: 49c79d3f093142c01f4bcd6fa4c7b871f148e1ee SHA-256: 5313c938b8ed401457d2a90928ebe1c4577e1d7c90c73b889c0b370807c0d904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe51b9aad---jakurevipafox.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c3b2f6a9---31635064491.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39027b345---84325645424.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89afe6e8cdbf6aaaf63452c96d24c33c/vezevibutujof.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5aaad0500---fivitugusowajemexemefepa.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/giripuronufe.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/21780092138.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/96147744059.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/bulozokidelexij.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/figigazivu.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/jawisuruseposevonokemuj.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3e4e784d---wipipukusafafugefa.pdfIn PDF document text
    • http://tele-video.ru/upload/files/43222812372.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/92090978046.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/573b158247adda33e02d3b787be88f03/patedopomonubudateb.pdfIn PDF document text
    • http://ruresept.ru/files/file/45026421518.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210719123342_mp8z4w.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b642f517---pugefe.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/fidobovixejir.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f48a704ec---17587980541.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738269b9a63---42285749224.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dfacdd08625---sazakopebesinibekasezepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=contrato+de+arrendamiento+de+vivienda+para+imprimir+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10540 bytes
SHA-256: ce85af1e0ce7c528c57a7e117ac8fc29ea596b1f3e147060911fb1dfc74b3653
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 17852 bytes
SHA-256: 012f3fabe3b45adc2cfed78c8691a978d4db6c5b61ec1b552b553779cb28286d

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