Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a3a3f032b0363e…

MALICIOUS

PDF

72.9 KB Created: 2021-07-08 02:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f3c9341cfe3541dc0410eb83329ca67 SHA-1: e8901fac8e415d6b80362c950867d2ad1499bc1c SHA-256: 95a3a3f032b0363e7285417f4a656604891b7e21b74b9d5ced8557e8ff1485f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of hosting malicious content on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=area+and+perimeter+of+compound+shapes+pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/ruzozedixilatitoxeza.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a7096c67---37240346498.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/mogejolenowijilejisowuj.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/tevizagefafibap.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/m4f48765pnclgck8jauclo5blh/66903158588.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2ea998a9---62052048449.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf02dc088---fopemaxejasabimonitol.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/31938588972.pdf
    • https://newtech-utm.pl/userfiles/file/sizinudoxaja.pdf
    • http://gorisum.net/fckeditor/upload_file/file/52678220480.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fac2ebc2---56349033570.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/etggh24annf0c9tscjc9p1k6i4/soxum.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607129509f055---dirowamiwibekofa.pdf
    • http://www.heksan.com.pl/file/kajititekifazatixe.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e1rmffoigjguh2ql9939kplb28/28054312794.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/430f8hl5jp3442ajbverbpeeq6/wofigumufudiso.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d350c59aae2f05c01d53741ff2a93dfa/zusikanufawoxigutevijus.pdf
    • http://bawaconstructions.com/editorData/file/97790735896.pdf
    • http://aisef.org/uploads/userfiles/file/file/norewipamovagon.pdf
    • http://promocode.lu/userfiles/files/gebukujadik.pdf
    • https://gujaratisamajparis.org/upload/files/xujosoxufaw.pdf
    • https://aonetreks.com/uploads/file/21680283612.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc490a27e---musiribifus.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d1d061d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 16792 bytes
font_01_sfnt_off0000d471.bin
c4a6091cd11f0b465b0cdcc217982a70aaf21d51ec3d0e495b87e4e3e972c85a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 10920 bytes
font_02_sfnt_off0000ed88.bin
2898ae6c713de92933bc9d015ec26d50a408e4ba892c2ca36119b6e2c92003ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 15880 bytes