Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4150ec38c4cf9e6…

MALICIOUS

PDF

73.4 KB Created: 2021-07-16 04:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c3f11ad4cdaa950a04ca00cbdcb0086 SHA-1: 7c6b6991b9450789df586d3ba71fbf199e56917d SHA-256: a4150ec38c4cf9e63b985eeb8734a0d2f487b2481f0df209a2a46928939dd401
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=kevin+khoury+md PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/852fec607d55f29a64a8c7bdaa39a91d/zolitelexexuwatodad.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/22286364700.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/53449455722.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/51210323883.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adaca39fce0---tedazisegufuto.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64345d7d0c---50454876781.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607786113db5a---36079589419.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/navup.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/72cd6ff284fc158089dd5d76ab59fa47/wofumojokajar.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/jotivorajigo.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/30034061464.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/91764966800.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77541649569.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/51288492479.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/48068215962.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/70220934800.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/lotusarifudosim.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63884ac4dbbc6b23cfc060f3eda29eea/94090085539.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9e00395201fd0d399b8e59271a5bf9c3/womorawedefelufipizofubub.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f4b2e8c5---48783971471.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac099c8659---zutopukipunofurisekal.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713ef7bc70c---59653273393.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/802dd1e108bf218487f87751a2b70ed6/37246872903.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fbaf3b814c9b28d7a244834d0456b1d3/kadobupegozijafuf.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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 16548 bytes
SHA-256: 369b979b8468a63ae597e7b414d8bc9f97398f6cb8beb2f7c36d1c54767abc5a
font_01_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10400 bytes
SHA-256: a8eee39076e56596fdb0a28e58ee33bb16b54494ef853f8796d0c7215fba8678

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