Malicious PDF — malware analysis report

Static analysis result for SHA-256 99441cf6ce77cfcb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-29 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 263dd0dcfd3eae1a8ba2c6954d06aae8 SHA-1: 69563b308345a508e760588f0ebc4459891fd6f0 SHA-256: 99441cf6ce77cfcbcca85a778bd147af9ad2eefd76b6f793d67594bad18d04cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm. Heuristics indicate these links are likely used for phishing or to distribute malware, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=descargar+whatsapp+plus+gratis+para+samsung PDF link annotation
    • http://sinostandards.net/upload/files/xofigujiraxuxekabez.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wemeven.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/gebosaruzuxikuwumuxusope.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fiwipozaxofaxadaloditimi.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/zevomezapubunowelorij.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/xenirinikasoje.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/68387345914.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d03a2a119f6ce222c27ddb887fd4af5c/xazabamipotonesaje.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/47933447873.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210917061200_100812.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/xogusobada.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bixutevemimabinixilaxutom.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/4769997954.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161535eec2e3a4---46471122296.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/78903179303.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/winuve.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4b8c7a5c4ffbe28c3b0cce1bd7d14a65/8866481347.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/67056087381.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jodizedutisirarav.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/juzow.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e812be3773---fogetimamalagugaxakinu.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/28171969474.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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10888 bytes
SHA-256: 1c7ed36860b3ece64c7df055f54a4bceed248767407970f243fa9f39c7c92d8e
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 19104 bytes
SHA-256: 4ee1a14be68ef5d29d9edb04c2624efe3cb683752e2af3558548d927e1bb3736

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