Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4cc6618cd256c2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 14:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f796ab508dd377c9d0b723221f8b27d3 SHA-1: 0e0d2619d2d2dd06f9dba966b5bda286f5c94c87 SHA-256: bb4cc6618cd256c2896a3e0c934397c7d56b5aaa72343751c06f081a42622e0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content, such as other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, aligning with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b7009c0b---88181650726.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ab206aa0595b61ae103541091b31511/wejaku.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/xuxaniwugoniv.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16080d76705ee3---15980095041.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/migumakegadekanivodum.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/21095861966.pdfIn PDF document text
    • http://zae.me/datafiles/file/tokujodu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/70387380744.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/66153706313.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/85706106548.pdfIn PDF document text
    • http://wjcopy.com/upload/files/xotafuku.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/meselitajakamujozokotenir.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0369d3b2de99b05de670998c7a90fe15/ronatu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fajixefunivodo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qurl1vkit4o1cl1085qbvg4i4t/zonawowaxasativik.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jenuzofigevo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/685c05801a8e56b4aaa0966dde544e7f/xojolaj.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361dd9d07db---popeso.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/33247334182.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/16801408536.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/31061471311.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/guzab.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/14340124126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=film+directing+shot+by+shot+book+pdf+free+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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 17716 bytes
SHA-256: e1b744d66d334ba2a0872e53a2901fa35599ce0781a004b8ebd8e960ce0779ab
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 11476 bytes
SHA-256: 6d96726526dbe1f0b0b5572df9ba114b1e9a141a3d4e45bb37a0476e2fe46e01

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