Malicious PDF — malware analysis report

Static analysis result for SHA-256 7048bc9dc7e429d9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 08:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8d00a31517a1f46d3f9b4febdf5a8f6 SHA-1: dd76fa2ca0c6434563c2a159b3fc52f54f1db399 SHA-256: 7048bc9dc7e429d91a3dbf47964879203e44ce6b7d5f2f36a475dda98442a344
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dkuhvmqtdagqjevifvu8d0cnep/votafedewo.pdf In PDF document text
    • https://kindeeyudee.com/ck_files/files/linukepaturu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/zonasu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161399537a416f---semofajedap.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/wupidolonuje.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wijew.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/jiramubumoziluru.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/53095423712.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/45572666701.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a9744bca96b03f79cc9e811a96a51cfc/zujemunot.pdfIn PDF document text
    • https://andrejc.si/files/file/84314002208.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/60408081387.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210902_003834.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/3384111476.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/rawab.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/71ae18ed05977e558a501d1d7d54fb93/58642052012.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tekanaxez.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/18166554906.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/vomajurufufuladeruboxekav.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dad39a594---91675149849.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/gasekakukewedoretivunub.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wuzogabogir.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/jagapiburibezugogowolelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cricket+icon+smartphone+reviewsPDF 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 18168 bytes
SHA-256: 1f0b3743fd43041ebeada81215b6d288206a833cc0e27c2763dfc48f8b20c7b9
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 10868 bytes
SHA-256: 173d9731f6b8de1766f75af964a03f8e4b2efcc7f566f8e0f46f86f31447b1cf

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