Malicious PDF — malware analysis report

Static analysis result for SHA-256 49965e327542ac54…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 20:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a7d44faf1ae0def34f56dcf5c5420bf SHA-1: 8f806270ab48925154754a9bf7b75c2c460a4b07 SHA-256: 49965e327542ac547f997787696891705c26f5a931ececc90f11ba235b4db299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links pointing to various domains, many of which are hosted on compromised WordPress upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b86150c41---noragul.pdf In PDF document text
    • http://polipack.ru/content/file/vamitazaxedu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c1c93ffb0---20475908429.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/larufaj.pdfIn PDF document text
    • https://onwater.my/uploads/file/tidetufozisizunujemarag.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/jedozunesalixev.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zenosegegalotuvabo.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/gexabofoxogapominageni.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6d8632be---52387255646.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/39832274932.pdfIn PDF document text
    • http://elskenecologie.nl/files/ruwilupera.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928d479430d---suxikozoloju.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e12d5be23---47107157772.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3lel6s0c3des6a4g89ifm2e20t/71938168758.pdfIn PDF document text
    • http://maksimetall.ru/files/gixidifeteramewefa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca83164f3---pijuvewilutonevuxesegilex.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/7981920673.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/15356396176.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161082437329b8---17186035754.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210629042214_fno07x.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b7c31e16c181efd6b5dbaaabe25c14f0/padixonolupevogalevonaguj.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/64017753746.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/6144157316099d43b1adc4.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/zupen.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/37619058309.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db076711cb4---nimubud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+adjectives+phrase+and+their+examplesPDF 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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 16748 bytes
SHA-256: aa9458e0b5c18a40d39c4dfd04a04828bcc7e55333a954decd2e4be653b76cab
font_01_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 10948 bytes
SHA-256: 88382f79595fc286e6985b8b8d7545681af66fc76b937a458796e39cd7164230