Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cf298b5a5150f2…

MALICIOUS

PDF

91.7 KB Created: 2021-07-09 12:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2859b6c91005110a36f8c18df91c41f4 SHA-1: 5ff7de17e51f6ab382c07f687c6437e0d171ad24 SHA-256: c5cf298b5a5150f2f4daec6f42e7810ce4b73cb72b1a1e1726f8d08ec426a720
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS uploads further supports its role in directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ccspatti.org/userfiles/file/kixujuzasiloleliw.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a090be23d0e---97403171359.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5amjitb33p7qvp4lavkem4p6i7/keludotesaxel.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2d4a21c7f32714e51565bc8d3ed66c9d/7747734400.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/eafc4c6dd151ec22f228f73f7dc752e7/57955910488.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429033607533931.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97884d337---46324971564.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5f774b31---fagorafujexuxu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/f8qqkch35cor1an16tn1v2jvg1/vamegukelinitasawetogerow.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/62499786847.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kalebutogisumegidanelorog.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/97910641980.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/13fff944b05d690b086eb7a538f5fefa/51525942377.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8oqrkeldauauc78bafikuquu9g/nopozoviliketewadusij.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/77319921893.pdfIn PDF document text
    • http://momsystem.ru/public/file/zofinukog.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35a4e508ad---wutukupepesijusitegu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18dbc3a6b7---86735691866.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/nawubigotakosadetuma.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1683843812608c5381d6dc2.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/puxitizoteb.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mn35ojgcagbhrmelm7u74l4384/pudisox.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/jozafos.pdfIn PDF document text
    • http://slsnn.ru/content/files/22513363793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=remove+domain+controller+from+active+directory+manuallyPDF 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_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 18660 bytes
SHA-256: f84c6f1394bb03239b3b84c81cb3c062103e77569d0c97f86141bc74b3129bc2
font_02_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 10796 bytes
SHA-256: 3b41fc21e821877048b44ef8761084a119af0b254c8e7f6d6a76f83f78b27b39

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