Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96691fbc467be19…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2fc34e34efe20afe4a6aff472befc8d SHA-1: 6fa05c0a56c6493183abb624b08b4da17c755fdb SHA-256: c96691fbc467be1959738aa0e4d50d8561fd9f3fbca682aa696a4c02459f1058
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=root+xperia+play PDF link annotation
    • http://crmloccitanecr.com/campannas/file/87222558879.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/lisoruwiwamigatupano.pdfIn PDF document text
    • https://educhina.mn/editor/files/4461238560.pdfIn PDF document text
    • http://medi-sen.com/files/files/28636681503.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/sovularuvomanabibobedaxuw.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47744507104.pdfIn PDF document text
    • https://finliz.lt/i/File/zinom.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a1f7ef25fa74cb1efc5417690b016826/22178318837.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/tezijosugomikomenijo.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/52295415940.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/64b9f4b544ccb898a3cae61c8e992406/91378844879.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6a7e2db138c931c2fc7cef78abe2d71b/mavuta.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/suponaripeseforonofavupom.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d5c2eb13bf5900ecfc957216649dd274/8166978541.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/zexalabuvimaxipuzitiludu.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/34161591659.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/gepajol.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/vepuzunodi.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/13889364779.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8654dde7---supemorakibo.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sumipedukujo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87d737031f0c9ff4d782eca6b92a742e/95134965781.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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 10232 bytes
SHA-256: 2064c5405a5817400a4cedb8cf73bac03e7fc9da1014bc852e3885568bae79a9
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 18036 bytes
SHA-256: 5a1911d7687bce543483413bda344c3c68567a099856939523d2952317c3a2a2

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