Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a957b06aaf428f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 01:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a949e819b0d46b6f676056bd10681aa8 SHA-1: 56dfb4e57dc4ae982b89d00d045427c4e532ce57 SHA-256: b6a957b06aaf428f45478a6c0922ce03e4e523bab28b63056701957bdca10152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b626eb8e5---xisosomu.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/28215304752.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/18691321906.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vopusawixufadepejusat.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wesatatawatotuv.pdfIn PDF document text
    • http://cga82.com/admin/File/jiwokumubewiribekusaxo.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/79075922411.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/41552596330.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/84879314892.pdfIn PDF document text
    • https://telorgabus.com/contents/files/16396200442.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b0c9ca61---48767140908.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/riwowizibapuluwefexog.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe6328a92---77541462980.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zexawujuzozuga.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/babiladekuvafifano.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/lipez.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/lewupaduxelunegakuviw.pdfIn PDF document text
    • http://bwc.lt/i/zijovemugopexeliw.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/xapovakuxazad.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hp062jggm3ke189stbblccdn5/kinaworakumidepujil.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/durorajarozarumufimup.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lisomoreroxos.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/76331008429.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/guvulomeraxuzororagomupi.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gomozupipebepozugabosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+trial+xtreme+4PDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 17868 bytes
SHA-256: f2755cefa34bf0bbe7dcf4df236738a4e89be6ff5190ce2022f7b14944377778
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10508 bytes
SHA-256: 92eda72c6a5689c85b1010c328dcb084a8bc69f269ef055b1460cf24d86c259d

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