Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a62decefae51e1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 02:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e59526de28c7e098c5b059ac173d73f8 SHA-1: 77c6fe583d31504292577861dd08a6041ee96190 SHA-256: 84a62decefae51e12e5b6550fd74577e4769df650c24fc7bfc18644d9b13b5b2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous links to potentially malicious sites is sufficient evidence.

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 http://avsa.org/sites/default/files/images/files/soxajizodiwotez.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1b776b100ad450e88e151d91161ed7dc/79172799993.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/6285088037.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/87094372529.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/lopomuripavu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd5c372a2---jisozi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/migibasuwu.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/47204797775.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc224628ee---49745638826.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/so8oejm8q4vgi43igmr194dhhc/1906770154.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/210824094418684181o3mlp.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2237c2a7---fusulagevajaxalewadafezil.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9a68cd7b---24623522079.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/38900768981.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6330c524c2---82695975108.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/30388399664.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89cdd8993b---furifosoka.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210611_075204.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/sopaveb.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/sirizigenaxafaniramofugi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/45bbf3df3fa2aa65542e37e523a82855/91668408591.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8887b880e3---9857202259.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/5654517626.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/38604925191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tolerancia+a+la+frustracion+en+deportistas+pdfPDF 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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 10676 bytes
SHA-256: a3757bf297f584783f2849755d0d3f750e4b7f39753c4ec06b9ccee3c53e3f7f
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 18180 bytes
SHA-256: eec14f32a29580b78bcd1040c6ee9df3035226941c5602c49a061a04eb37054d
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1