Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe4a8b3f0797a15…

MALICIOUS

PDF

83.0 KB Created: 2021-07-09 17:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96927d614745833a2c1dde39a973daec SHA-1: c1a9e9788f41e59052b6a42ccbb7280d4d454347 SHA-256: cfe4a8b3f0797a152ed16366bb49f872ef8e24a4382e2444131cab20e8f97614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+to+fill+out+a+d%26d+character+sheet PDF link annotation
    • http://strategie-online.net/catalogue_dynamique/file/26686007060.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/kavuv.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f52df015dc93138f3680e16e316d5789/kubagojepixirewesemovub.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/41216136943.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2d5179089d5df90f9328cc568ac3d544/29283281101.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/31252399731.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gupinubejodajepemajezixet.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dujeravobinewuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1daed3c4---kisamuwelipelalub.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/41357617666.pdfIn PDF document text
    • https://noddy.nu/images/file/28039906750.pdfIn PDF document text
    • http://envigest.cz/upload/file/sewosunof.pdfIn PDF document text
    • https://eternalbliss.net/file/78444041335.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tumap5idd8l9etp6plgunh8el/63455730663.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160767a0b806c8---95512896303.pdfIn PDF document text
    • http://garderoba.sk/images/_file/72958659009.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30675ef595---18483506508.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/44251360847.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/kavagubapetepep.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b215eba---91897525229.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ecd696ed643a8afb4673298564b610bf/defojewusogikifedim.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/72391245914.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10020 bytes
SHA-256: 2145342149adefa0dad9451af18804a6baf784a5f33d0e55a40c7e3cf356def8
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 17304 bytes
SHA-256: ab6b243f4641a97d52565522654699689b2060dcf176b9ef94c990aabd432b9c

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