Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ffd6fb7f920e07…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 12:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f6e3d03f29dcf899c762b811f8a546a SHA-1: c94200d2f0ecdb3b7530281a4c93a5e7ecbfe82f SHA-256: b7ffd6fb7f920e07b3cbdaf205e1330eb58b5767688e454a949f4434d046f1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://huntic.ru/uplcv?utm_term=central+bank+exam+past+papers+sri+lanka+pdf PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c3f80441---12523439107.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/basopuvofefagemam.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7c8ef14b---lakusiz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b320e69e7262be8d234f68e60c61fc47/fatekazewine.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c712e8c63bd60a707e3dc302235c33da/82056358087.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/lixodumiwogi.pdfIn PDF document text
    • http://infosierra.es/images/editor/jobugiror.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4be32c32b---36062374003.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/depor.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08b55cf42---97411413723.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff79f3a556---jojumorawiwuvinu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9e48ba73---gubavodumuram.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074fddbdc493---soruzuxojojipuzalefujebu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/67221207497.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/1302142794.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/20515969074.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/ff0d5c542455bf3dadd7826dd01c646e/59017228531.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c2a6bd884738ff88fddba7d34a8072aa/ratipigelidezigorusode.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/vekuzidoxujematax.pdfIn PDF document text
    • https://nomortiga.com/contents//files/91857401789.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac996c8965a---goneribenob.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/10254707555.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/98232572686.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/38872145778.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 10904 bytes
SHA-256: 12808a242a6f37e0e8e0d2f554081a9fbc1f93f55004bce22088cd49ca3cc820
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 24148 bytes
SHA-256: bcfb6164e90ae7eafe126ec75156cf27938e58ec74b56e4c0cc77f2ae4c9a916
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16556 bytes
SHA-256: 38ab14374ce66e930d04adfdb37697a05c56f023f6f07ac64f366b8856be8db0
font_03_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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