Malicious PDF — malware analysis report

Static analysis result for SHA-256 4265d8a059d67c7a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 22:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f33ba6972f45dd0d29a79f0ea1d9b5f4 SHA-1: e2e639de0fe7ca3b50127be7f89b844c665b0878 SHA-256: 4265d8a059d67c7a201487805675e7ebf82d22dfb68057005129c85e6a370f0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites and other potentially malicious hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute malware or conduct phishing attacks. The embedded JavaScript may be used to further obfuscate the malicious links or initiate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e5eec04b---sejonaxora.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72fb386f877ab06658d81e009faa2a93/zatosimon.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/20772088626.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/fuxewuji.pdfIn PDF document text
    • http://www.grifin.sk/files/3172805235.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/16330220242.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210906031628.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/59991123629.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/pujotej.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/rutigunuk.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/tabulanawuti.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161329729f0724---nunaw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0f44e0c6089081378ff7174cc953e18c/bebuwoxunirudonamasuxa.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/69392508351.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84801506485.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613343f4a1819---94081670152.pdfIn PDF document text
    • http://alcantara.cz/data/file/widuruminogufoxi.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/95660792872.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/vobofagaretizoburinaponu.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vutibabi.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/nelenir.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137853cc816b---68553142407.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/fofutivuriwos.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/76635858091.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/xazawikoguper.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/83212806878.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63d10de2c---1097425701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+enable+developer+option+in+mobilePDF 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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 16512 bytes
SHA-256: a20bd6abed7b30367a6caa92a98a2812dbaf8a51409be68848d5672b75c5dbb2
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10668 bytes
SHA-256: 733cdf01b8106f7ee6852c3ee172b51daa312903af4712d8fd4b563f22cdc91a
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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