Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a946d3ff939164…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 05:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 906fec5accd3f18d3873ff30d598a5eb SHA-1: ffa3812c833e3a6c16e1a1ace33dd043f822a941 SHA-256: 74a946d3ff939164fef3c74299d167b581f2732ad8f0568ba4b0274adfe04d2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links hosted on compromised content management systems. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=drift+city+android PDF link annotation
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/34541064565.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/livodogugorowixib.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nosezus.pdfIn PDF document text
    • http://fxlcd.com/upload/file/30125931727.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614834322b1ec---biwobejodufipakomi.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/tejulemo.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/jisajojatelelopogadu.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/nakiwipanerifabika.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dameperogavuvomapezuw.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0340527c6273b5fee5e90260e56699f0/96672264621.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/50808691172.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wetebanemere.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/lovetusizowinekekopike.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3aea0ab---99690018855.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd7799c28---diwasupogoxifuzekimomi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/43372938a8f0a1ddece0903e5d051dff/63193641880.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/89908517185.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/bazuwajezejosoxifo.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/66715628370.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/62361581109.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/10495656285.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/dibekunorotupajo.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/lamugelarorekoketiri.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/13496098777.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/lusipojolurokire.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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10236 bytes
SHA-256: 768f1ce5e678b763edea52f1dc1e00eadc5926019aac9167b69b8464c01cb8a9
font_02_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16488 bytes
SHA-256: 5fb578f030abd2080d2b919ecf6a19ecb5cbe8d0fe183ab9626a0902011035d1

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