Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5dad7985369427…

MALICIOUS

PDF

92.4 KB Created: 2021-08-29 13:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5893fe1d3ee25e6274e7383bff05181 SHA-1: 1620199491c2d5385ba2a5cc35b92697dfb4d5a3 SHA-256: 9b5dad79853694278aecc6b113fcf47f429ea896e22bcd46e65626f501f7380f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://signaturecruise.com/js/ckfinder/userfiles/files/leruj.pdf In PDF document text
    • http://westernmaki.com/uploads/files/xasoxolilekotanuxubo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/benaxawewumajakivumupat.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02e0225a5---vorozi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a778433f53ee5b3d7ed94103dd1de0d9/15656200790.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e448703839---gamibi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8990b2725903c767d48d34979d2d9f9f/diwusipivakatojegolegi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607470391efbd---duroj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d154179bc0---vesarodup.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094491722553---dirobeme.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lakemufonuxi.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/40422977751.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xuzinopetekigod.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/75983261049.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/70125783989.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56723953574.pdfIn PDF document text
    • https://kawanmto.net/contents//files/vumajoko.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/12415894486.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sgdv5ieal2vrijodnvbq9cpcsb/bepotupixujuvuju.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/dexakuzekajodowadut.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zabimiru.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/700726bfcfdcaa48dba264f9b95a6a4a/widugiwebixivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=star+wars+whiphidPDF 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_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 18084 bytes
SHA-256: fd9bfaa837337a739d80436bf9cea0bafe4068e4479cbba0aae0665bb620ba77
font_01_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 10248 bytes
SHA-256: d1f363995d01013c88ee13e9dc0b0d06bc4c4a2d2edca5c77a2220aa9e641884
font_02_sfnt_off00014a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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