Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac0b1ef39527f39…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 13:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ee31828bbac2797572951c683380a9b SHA-1: 032e74c2ddca686365f712c7c290840a00597cbf SHA-256: dac0b1ef39527f399bbd734af3827cd6eedc3d8a6f73689e10d01c175ac4f3f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6cf41769---kewez.pdf In PDF document text
    • http://frchem.cn/upload/files/pazatato.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/69471482227.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/70086589268.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b20f30fd7---59933477555.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0mfrkkqis86ktkmub9ipsnhbq6/mebanaf.pdfIn PDF document text
    • http://rc-modeller.se/images/file///misisifuwopib.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ts3v5gtva3gdv55o1a0qrgl92/pivakexesegamenedoxixore.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/45328104413.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608251fa23be7---48355886065.pdfIn PDF document text
    • http://normel.org/files/upload/file/tuzusilalefidagodesederob.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/sibejufisusijanewonix.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/79434062304.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/zedarigedud.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/luzali.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160817d4ff23e0---71451981901.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1kigca88rlfjucb01tg6gkvsm1/lafewujum.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ritelafolaremodigobewek.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/xitogusimofejojomedolad.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a81fefa0c---64845960577.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/55766060807.pdfIn PDF document text
    • https://isleo.com/i_photos/file/53005674291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=joint+apprenticeship+training+committeePDF 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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 17844 bytes
SHA-256: 88dd4c800e7e2c1f5c13419c9da13711a5798a0bbb8a801b199fb3b4f96052ec
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 10768 bytes
SHA-256: 8884e5af744746fed257f54046de4153018aae7c1d76150e31830a5902d3c5a1

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