Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac9a0699188165b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 18:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58990a2477dd57593433ec5bf3bf7ca6 SHA-1: c2a680bbcc43c6a1eb1918a5fd7657cc7fde9aea SHA-256: 6ac9a0699188165b6ab5e35a57e882f1fca2b811f5c758e12eb93bd2353755ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute phishing content or malware. The embedded JavaScript, while not fully analyzed, is a common vector for malicious PDF execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=galaxy+theme+store+apk PDF link annotation
    • http://chatyzvule.cz/uploads/wepiz.pdfIn PDF document text
    • http://alptw.com/images/files/69681570599.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kogarosemupifidosa.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/josidiwusofagurerot.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b6df302b3174656e84367d9ee0d8d50b/negujedu.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/taremalusipazolemoforu.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tavexowikamivojazok.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/42237573272.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f04f9e7b2c6ededb4bc5903892426d24/vedufotojeduzuvab.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/rixuzed.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109172054071907.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd3247d95---30691106451.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/vulegabativok.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/ruganagutajep.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/favaniruzawezedefirimavur.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/wasum.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/21249607335.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161459739c36bd---fafatemawoki.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/50048033227.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wulupubu.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/bojadamulelewome.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/38862339060.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5d89b2e8937f8f7f5a710e73ff75f9b3/gefisanaja.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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 10668 bytes
SHA-256: e57bbcd15d227099b32787c083e4daa40717265c07f51ac2017764ea07ef8d40
font_02_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 15644 bytes
SHA-256: a8ff0922d1c523e22b024fc9bbecd598721b448088db5cdb27a6773e1bec2274

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