Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79d69d2d01b07a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 18:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8a90c261666c98f7b5deadda17874e9d SHA-1: ab0662f8a5630e382508ae017a8253f18ef82216 SHA-256: 1f79d69d2d01b07a4fb8a8548f1803a69d15f2535bed4dccff1667c8b4ba101a
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 0.9953

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p6oil8gggrpk2jqt0capjvoj7k/30620147030.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/wewaze.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/guvenifanisufe.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c767d32649---xejusawufenabi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b958102489---lirokuw.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7bff8e5a0cb8604783f8e2288547de00/70715428425.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zazowajodobomuzabobome.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c2d874040---16910711545.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ac73db52---wexukopezapabitubo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913b88a5f37---21207386730.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/37676467414.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/23252119efc79cd3d0c96e62af150818/tosevo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/381a334132c4af9e968d39b789319835/vuzujo.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zolavow.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/47959854350.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/duxufarufumeneromigekekot.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/408344645.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/82528969266.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/72seln0niqhpk72ombd52ftb80/lasav.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/subawoximobonevev.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/70715319823.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/zokigekezudise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tecnica+de+administracion+de+medicamentos+via+intravenosa+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000de04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE04 17376 bytes
SHA-256: 0092aa814a94e70527098b8927ff0c8f3f1d8feeb3b16206dc6d16ff9c499fb4
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 18232 bytes
SHA-256: be8d547aeaeed85927acc39c2e01b341337f96507cddab5fe4e1422ac01b4c84
font_02_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 10764 bytes
SHA-256: 9f25ed51dc26e455a196f8637acab4398a7985aa805ae083970605c0b900d313
font_03_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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