Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cc28e770bbaa7d…

MALICIOUS

PDF

67.4 KB Created: 2021-06-11 05:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d4bbc2d4ace6faeb78b97376862cfc9 SHA-1: 76a05e869b39f155838771c594cd41ab5985fd44 SHA-256: a8cc28e770bbaa7d0d4a858bb18632cb5feea6ce2d1b0172fe80cf7586085e7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The embedded document body, though partially corrupted, contains text related to MP3 downloads, which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=woh+lamhe+woh+baatein+koi+na+jaane+mp3+song+download PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/20357699961.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vexup.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0401c57d---44736526916.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/vewifasepesi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609865d146fa1---nereros.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kexemunufazobimigiz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/af59edeb197f554b77848cd675140e7c/28665788462.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/gopogagetetexezinunok.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2807b8b0e---muxafimafurowoxubureloku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076073ce3e0b---56192092796.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/57144089333.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/jozokotenotijikax.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/84664795630.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5b120d6f07fbd1fbcf791502bfdbc9c1/60764414689.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cf3233f9---59654987493.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cecdac3e0---foxetitelonujasulomumig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 5824 bytes
SHA-256: 9173df5177e2519a5ce186ba7722bb5403f91a19da0ac656e4b5b1298a03b133
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 11152 bytes
SHA-256: d3946b58748150a042522f7adacb1a8b938d59675b65ce5532c4fbc0806964e4

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