Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd321c24f9a7a53c…

MALICIOUS

PDF

91.7 KB Created: 2021-10-08 02:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff30dea96686f48fe51ad281d75e63eb SHA-1: 907fbbaf3e3448b4129ea50066e8c0f60e425ea4 SHA-256: dd321c24f9a7a53c90fd92c2fe0c2ae7bf6b498e198e476174e52822474f2626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing links through PDF documents. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=positive+anterior+drawer+sign PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615287665d757---2410684437.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/05bb1d72cdb73ab76611875701433c5a/zokizututupenoj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0c0a56571985ac5fbb79deb17823fd48/jugiz.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wikenakepemap.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kefamivudegare.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rexunejinusivatimo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/81335185227.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4add7afe5---24397497638.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109190215265049.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3fpgu5c72on0kml20hf4gahdt2/14700914190.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/16599510604.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/84346295227.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/sarad.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/67663238066.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16152774506a5b---zufirutalejubowekevug.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/dusadogemofi.pdfIn PDF document text
    • http://espokebar.com/uploads/files/vijogekajaja.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/29756918696.pdfIn PDF document text
    • http://videlec.be/ressource/file/vujevuno.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161388b34d6425---liridusisezej.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/xolatubelomak.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/42772547562.pdfIn PDF document text
    • https://nevisnews.com/userfiles/detabamejolibami.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vukekoximuzenodu.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jixabavuram.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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 10528 bytes
SHA-256: 6b3e4092a46f740803c549b46ae3dc2a307d1a80da44bd4fad764f9789e87f88
font_02_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 19420 bytes
SHA-256: 77c6b5ffbcd279e73ff1c071afe9bc36fb6f2981a0d2fd2712bc9098b198ffb2

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