Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af8af046c172feb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 04:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99824ff5f5b46e97c5c9f34f8432f628 SHA-1: eca6e77ed37b18fc8d5ecceed36865f1e048c0ac SHA-256: 8af8af046c172feb3fdf1b57a324cdd21c782bb5d3c66a07e60a31ff9b03a332
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document lure, impersonating services like SharePoint or OneDrive to trick users into accessing a shared document. Several heuristics indicate this is a link farm hosted on compromised WordPress sites, with one URL pointing to a PDF file that is also detected by ClamAV as a phishing trojan. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0cf16eec---wosofesuwelanowufubepaxo.pdf In PDF document text
    • http://ohdiabo.net/images/ckeditor/files/zuparotejosenadoxi.pdfIn PDF document text
    • http://topp.pl/_topp/file/6540027997.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/betibegarukepotegaxubod.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614074bc92ea6---44645703256.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/rerotobenepug.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304f6f0b97---pakifusubivokupetezema.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091009504921663.pdfIn PDF document text
    • http://newo.ru/files/files/lipusonulipimoritadeped.pdfIn PDF document text
    • https://ivanamihic.com/files/22465352741.pdfIn PDF document text
    • http://quetthe.com/upload/files/buvujafogimogubuvatik.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/97524474110.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ed97800261346503ea31e5e85d10cf35/12025407258.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93739258745.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/68444278622.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/13993173876.pdfIn PDF document text
    • https://deepex.hu/hirek/files/14209181846.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/63432769537.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/24136473830.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/754091250.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/76780675342.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/06044bc0634b609507f49a01a94963a5/zapodowubebujubowe.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/21099766104.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/85456868268.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jilujufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sign+in+to+outlook+on+iphonePDF 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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 18612 bytes
SHA-256: 7be7d734a955ac0f01c0b17676208916f60e9b4fca005db0514bbb32ff344271
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10368 bytes
SHA-256: 32ce4de100a7c914fdbfc71b763b3cb75c5d15c8900b5fc3fa18500c25a2cab7

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