Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6404afe9c671c9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 02:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ae589f915ff2ae330edcae9cd78e6b0 SHA-1: 8c7b3096059f2780f3b0dda9407c08b7b37c26b4 SHA-256: 6a6404afe9c671c9fd56e98134470e52e8cdf7bbf3b10702ed08bc8210e7ea2f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and content align with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=top+random+video+chat PDF link annotation
    • http://ueros.fr/admin/ckfinder/userfiles/files/57751595083.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22865095215.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/rakogatefabine.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/94309557280.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd45b012dd---26201769699.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579f4d81d9---99499602526.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/88581993664.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091514021473499.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9ef19e59---97447402481.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901232323428620.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/10836670570.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/20384350829.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/bogajewesujututibudixu.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/taxinojurazipokipotelab.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/vamefigo.pdfIn PDF document text
    • http://saimiri.name/upload/file/41588183061.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tunuwowefi.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/85301469237.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/zuneradetiwaxokixujurus.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/4359782305.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/97394915855.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/datikodilesawa.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/kowebewixatofagifapodase.pdfIn PDF document text
    • https://anfauglir.com/images/file/69955918564.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10596 bytes
SHA-256: 39c7897082b3ee9cd33612494f25d413be79e6609375495b141f5da2ecd5428e
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16984 bytes
SHA-256: 9fdbec9dfe9f6711c9849856a726231d20a00c200c152376bb9fa8b374f8067f

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