Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec08eb36d27837df…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 18:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fb5b1ad4ddb347582514c4ded1deed2 SHA-1: 213778054829ff19b1f2bbfbc47f1fe7b4b5476e SHA-256: ec08eb36d27837df00ba2e968843955b23fe0325abe8fce9012285379cea8ee6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of PDF-specific heuristics related to link farms and compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=mobile+to+pc+screen+mirroring+apk PDF link annotation
    • http://wjcopy.com/upload/files/ravanatajowame.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074f682143---1629707323.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/56561982560.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xosasu.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b9fbad78---55256652051.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/pixivusanefitefilizuwalap.pdfIn PDF document text
    • http://wwstationery.com/files/file/21674975693.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///89681667940.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413995ad790---21644549180.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210912_022322.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kowijevilufigiti.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/40735158998.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/32022938917.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/kutezoxujivopi.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/95250421967.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/vurexude.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8f32848b---wekazenajevapudabugezom.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/makapasitotokafububuja.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fbl836rgg36bk52bgv3ke1n32a/zikigumon.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/diwerapofivavorebosafazum.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mutixojolakovagupakifod.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/pefirejejilafox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 18460 bytes
SHA-256: 4317ad6f9f590f0845749658d6fc1669ccf82c50bb63a56ef71135ad34663d45
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10944 bytes
SHA-256: 248ac308373902c3c61f33dcfaa573a43a7bed3a8035a4c68f6472211cbda584

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