Malicious PDF — malware analysis report

Static analysis result for SHA-256 960cbbfa93fd1eb7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 02:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ba2f23154c4708e2d0b753e2ad06ab1 SHA-1: df95431baa53e92243a75acd378451a5631e5ee1 SHA-256: 960cbbfa93fd1eb704bbc1cc8138712685cd710304da0a1b92a7f69aafd1d0fe
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=conduct+certificate+format+pdf+download PDF link annotation
    • https://airbays.com/userfiles/file/tonugusuni.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/numukupuludujamizaso.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd907e00a---jixazimaxudolovitilejekas.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/85467009225.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/19962478936.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/36102389966.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/pukem.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b370f14b961---pujaduwuzekoxulevatib.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/totidumigasili.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f91d5017fb518bc1a131bf4697f65ffd/kigebutuzoxal.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9120c43994c3d9bfbcbde13c83b76445/rosutureloxapid.pdfIn PDF document text
    • http://samtle.net/ckupload/files/xusuzejivepuxurixoxewof.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/82931352520.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0414c705289788e6a0e5894dc4881888/74454420530.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e3cc8c1801d5df0b5c6355cae576f454/46547020151.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d309e66fef5---23273080108.pdfIn PDF document text
    • http://watch62.ru/files/files/rutuwamejesinojelewavukup.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108170409419489.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/58413399416.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087438eddce8---wovixabeguvebup.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/remuxasabikikakaguvuviw.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/88862102819.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/78421725533.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/29782349316.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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10832 bytes
SHA-256: d78b3ab0427ab1ea19f51fe5b618112ac06fa9d063bb62382b7bf97e9cab3af7
font_02_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16376 bytes
SHA-256: 906877435d818e9908d0fcb8ba292869ad8ca8cd172c92b6a206854f310e5934

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