Malicious PDF — malware analysis report

Static analysis result for SHA-256 9960f64cc119dbdb…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 15:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2af1521b87dc498bd7eed7a0f3e6df04 SHA-1: 8967e5fb50558f1ac9e060381f134b0466c21308 SHA-256: 9960f64cc119dbdb0ccef94e5705cbd0b1b96f3de522eb3c2d420057317521f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised CMS uploads. This suggests the document is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=self+pity+session PDF link annotation
    • https://bodegoncriollo.com/userfiles/file/nitobudaj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f13e7788f2b---fopemem.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/gusafofaxagepajugow.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/jegumiwiwuvumidetugef.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/80258571773.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/bijek.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/76365950760d9456ae5803.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/10980950345.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/51534976993.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/14468039606.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/vobamulaxadasida.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/mukidanuxoxawofotoje.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab989b94c30---xanopoziwidadawupikezuzu.pdfIn PDF document text
    • https://thietbigas.net/media/files/kavodafefekos.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0tscei3d1fg84o2n7ivncal67g/23661547069.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sijimiwizatejobuwavirugun.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vipilanevuvuxiwemowu.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/xuwetedopikizuxo.pdfIn PDF document text
    • http://abnicum.com/files/file/65697565993.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/55622063248.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072014dc7648---lugajijaxatugabufudabenif.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9521fe8f2d---21223413179.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13998b176a---75576568770.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/52048050958.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 18756 bytes
SHA-256: 3975280e58fcd1e1a5074277a06ef4f9b77ca802e51d4ea19eafabe6774a6836
font_01_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEF 10276 bytes
SHA-256: 7543233f9951e2ccfbacc6a272958e1b9bf94c96bf8ef9eacdac7a6008222217
font_03_sfnt_off0001562f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562F 2332 bytes
SHA-256: d4790e92e9e22f74efc4db58e4d78f2e4b254f6069ca24128c0b9fcf4fbbd632

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