Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c59c87b3dc14e4e…

MALICIOUS

PDF

97.2 KB Created: 2021-08-02 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 848095c95570c2b6b23dcac953b72fe4 SHA-1: a4d7b098f5be818c383e267d46002e5c287dad65 SHA-256: 3c59c87b3dc14e4efbb7d375c87574fa53032c407d019df493b9c5a2cabed5e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xo-sound.ru/userfiles/file/3626006212.pdf In PDF document text
    • http://cpgny.com/userfiles/files/83570633491.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/31872063685.pdfIn PDF document text
    • http://drironcat.com/images/file/fifizopiwopedobuku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5tk61nb3vm78cstatuta3u4ian/redinanojuvuligenadufezi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a70dfc25---refajanomu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8c3ed131321dc4152ce220be1643ea77/sunabuboxotiwomedab.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160864ff2ee5df---91608633804.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/ponete.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/saruxoz.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/tavalonosaxelasafatov.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0a1dde16bf389a16b5fb34a42327d74c/bezebuvenagubaxatipoduf.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f7a9e5c2---malal.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a964669622c---73174445842.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7d5406c4a1486f7dc29bd8d34437bd62/95510304332.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8df267b6799f1068776a13d1bb488f4/64355271083.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1532737041---77993479582.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a92a19b21---77946043241.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/sakabiwamiz.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d94855200eb---videmerutijolegiris.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2345acc684fbd1c538aee2a96cdb391e/xubadikuwedupagafogon.pdfIn PDF document text
    • http://cycling-software.com/files/file/63096465324.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/55555313291.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/kokerivapesuxibojuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=me+divierto+y+aprendo+en+preescolar+2+pdf+libro+del+alumnoPDF 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_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 11316 bytes
SHA-256: 4f6b747fd9700c7e354e9e90bad86f4b3782a3a723332df5f02674346c30b4d8
font_02_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 18840 bytes
SHA-256: 1ba89dcbe97a3aa9140a4017198906fb243ba18e2cc85ba9ae0031804cc3f886