Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c59c761fa02c3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 03:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f86c84c4140f88217660b0858a536156 SHA-1: caf5c33093d1e9c9b0577707bb04cebdc548cc40 SHA-256: cd1c59c761fa02c354b66a38a4c5552cb4c3fbafa54ec906f0b37e5372fc69bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to a phishing campaign leveraging a link farm. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=how+to+root+android+10+without+pc PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jixofivexuregoporiwovo.pdfIn PDF document text
    • http://www.pilartangguh.com/file/38232102122.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161392d60a7b13---nopariravolum.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/bapovilagabew.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47109134917.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/xoxozavajopufaxeduwe.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/62232470302.pdfIn PDF document text
    • https://equalland.com/uploads/File/lilosigewodirelelafiged.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/72730263829.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/neromakofonifusenaroliw.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/tudebitebaf.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b32c13654---rodopixukakozaf.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613682769e914---sutoxanivoluxuferufuraxu.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/97560336291.pdfIn PDF document text
    • https://ratosatu.com/contents/files/69245967937.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/womefepazatodofas.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wofotidowefubekij.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/lujabomizimopiri.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fa3372579c7f063d417b8e4b9371c97f/43803443724.pdfIn PDF document text
    • https://taperagi.com/contents/files/derogasikero.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xizamokuzede.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/98461706753.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/2911408176.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/wamatow.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p7d8vka95qf8h7piahpurf77s7/86541576747.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/sutitiwetepa.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10616 bytes
SHA-256: 5bf14ebe2dd02e0617e4865624b3ad9f680333749c182e20fee1eabc65e89454
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 17620 bytes
SHA-256: 571885a57b818abf4bc313d838890d2d2ef340d6d3f528963219ecd6037be3d2

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