Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2095bb2171da4b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 10:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 61f0308dfcd04a96b355e78a5b11ecd0 SHA-1: 3e14a653ab06a6d7a7d62fbcd81b54e360a70565 SHA-256: ca2095bb2171da4b19d33a4d55209c1713397bbb176e0bce16a2947b95a86849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=vierecke+%C3%BCbersicht+pdf PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c559125f85---tipaxabuwepaze.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/makud.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/nelibujofuxazapuvawu.pdfIn PDF document text
    • https://grandstone-egypt.com/userfiles/file/19452098664.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0b31319---boxulisiditi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/kinufoja.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/81116677212.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jamaraliviwapupivikomos.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/235b6e3c6ac852e5cc8b4c262980a4af/25448934732.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/tawekigatonenilaligogifi.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wilepiximabim.pdfIn PDF document text
    • https://schmitz.cz/res/file/78479902052.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/n3tp8e39gdu61202jv33qh5ggr/61208324354.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21766047260.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fbbba05d602657baeedf7d34c520dafa/valexuw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f183b902---vefemozu.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/fejodojiwiranafunize.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/98636811908.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/45695824519.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e6b3ae198c610ee6e5c77aed5ffd7b57/rumokirefos.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/32803281194.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161040ef0f0808---zogavuxagokuveropawunovu.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/luxivopineti.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_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 10680 bytes
SHA-256: 50c190fd7ea87b10774264b1ae9aa4c7c9dfc303bb1af37a9302a2d95536a5b4
font_01_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 18212 bytes
SHA-256: 0f86c990b107c001559f4bb6a66f59d9e105e8cdbf9a0ef60dc58c78212006c5
font_02_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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