Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab84a163bd35f4a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 11:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56816028a6521eecf7180ba3c78536be SHA-1: d1986bc188963b5adc5fdf39f35a185be28d94f2 SHA-256: 7ab84a163bd35f4ad16ded266dcbd0d2a269a5d387756da391983bc11c990101
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 or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=tesol+journal+articles+pdf PDF link annotation
    • http://tbff-bygg.se/img/files/72351195524.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/kisuf.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jiporan.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/nijapidukadilexekatezivu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a948cb2a8c3---87332074197.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/momunokivufimegijuzigu.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/roribomab.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/86057136350.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/jodatukiguduzewuset.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/dcb5ddc0f75a8cbe2309df4d1ef57a7f/98394343612.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9444020efb---zudokupanebawopoviwujuw.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/sebox.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnbmnge3vtj0m0qbhrq2kih896/dedutuk.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e5ba35398e72417e7272cb94de17a62/gatozif.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/wafibaloperokogaje.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160884e619631b---62566628633.pdfIn PDF document text
    • https://ikima.fr/uploads/file/83634422285.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///84371154088.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5f43b9da---janujazoseliwoxa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/26847435362.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/purebubogivisujoludis.pdfIn PDF document text
    • 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10808 bytes
SHA-256: 638b54e6e20357a55f6fb18784f02c6b52c1aeb2f05ec445094c80ebe3c2c6dc
font_02_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 18064 bytes
SHA-256: a0cf32d69480fea4e700836464d41c300ece24c311b2485955c97c8d5c2b0095

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