Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d8f9013dfe0c9d…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 02:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 499dd8cb4a8d565720dc783610555729 SHA-1: 9608b2b4b3d8404d08e68b9ce89cd9c1c8a8cfc0 SHA-256: 03d8f9013dfe0c9d94ef0459d52ace1726cf9970be63b08ccbbfab573df64f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document's primary purpose is to redirect users to these malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=if+your+teeth+are+yellow PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b626a13f9ef242f128093f131cb604bb/1879947176.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae3abbf2d2---37674303934.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/803f75ead2805fe7cd6b403a382c492b/44936289796.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bc2404fe2---tijoxuwujo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d527e9a1c5107e0f1c38f6af582b177d/46817498102.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/02264cfa5c96e40e877b1f761a5d7e91/zuvelafiguxiwedovu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e0ee9992---pixekutusidel.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b278c4c9a4d---48936224469.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pixawaf.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d6d4c2c---57665461000.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/juxajilakama.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/42874468399.pdfIn PDF document text
    • https://mollis.rs//files/vakeliroxomifugurula.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/weforazakivewu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/64035087da8ed62f3585566b1f8ab6ca/87287364179.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/71682879796.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/42076608675.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c8e9faa7ea08ddc3dc0779fffd6a6f12/18477212832.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d39744df417---xonifabitafilijano.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/logofabifaxejotovutifo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/uaamcvnnetjkt9kkaa4hi59005/dofikiba.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca77c6cab9b---39037569001.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1036e877dee6c7ac169bcc2fb929ecdb/33903649008.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0fa99f8a386facd58231e8dde36fe32/82945479748.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_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 17092 bytes
SHA-256: 6606a239bbbe4b4da3bac2d86e7c7780de879dde6fd29141dd15a0d1fe42a6b2
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 10200 bytes
SHA-256: 04e674f0cf126b155bbaed8697a4000595a0fe3be215748a0be8b18b7305c91c
font_02_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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