Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3de65b58e77952b…

MALICIOUS

PDF

95.3 KB Created: 2021-08-28 17:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4929231055a8a41e79783469c277d47 SHA-1: 9c53de2715a40d041b66a42224310f1f17fcdb99 SHA-256: c3de65b58e77952b2d82636ba5906c6c5a2235e28f9667f17eff9b94c5de0cd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dynasty888.com/image/files/20210622_063738.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa162cdeaf5---zobofukepekefo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb32ad9667d---75886951358.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/nelijib.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/malujozutavaxodenogamovak.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/54247462726.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/85020415108.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61817907755.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/92187527524.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c389ff1ee53---93377868906.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gaxebagoxojak.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/vovefepumesugelaru.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9700a8b24---wunonozuzoti.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/49732575283.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/16101771246.pdfIn PDF document text
    • http://emeat.ru/var/files/59859084419.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f4286f0d62d---71527433735.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/sabiwukovupagaj.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/bazogud.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/35425505177.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/234741d4535cc247a52f2c3849dba71d/sunenaturinisenojukidopo.pdfIn PDF document text
    • http://bio86.fr/fichiers/surox.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/17643565589.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0ca86b30---jusuzalajimidutigofate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=love+story+in+summer+pdf+downloadPDF link annotation
    • 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_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 18808 bytes
SHA-256: 1c3be047f5ecc8250d41328cad4f5562e9c3791a21f95ef237e270170031df8d
font_01_sfnt_off00013cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 10984 bytes
SHA-256: a0a9f708859fadee01da90c5ab72376a3099fef9ca118102832d7d8a8d188f8e
font_02_sfnt_off00015645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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