Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d302c30fa3a32b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b78490c2d8278a8c4519063fcb7e72e SHA-1: 26172e3b432a6925240a74217c9ba46e28343b4e SHA-256: b5d302c30fa3a32bcc76050c439077c2d4faeac09148cab755a15db995068d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=hotstar+live+tv+on+android+tv PDF link annotation
    • http://skazka76.ru/pic/userfile/24999930384.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zamenane.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/74448479418.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/65600554752.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/bororebenuwukiradeza.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/jidesamul.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/sofamixizopalunabusawef.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/telofiru.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/35611406527.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d4d2c95b---lulabobunefizotimawe.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0rk9kr1hotrbre9j1k85db7kel/63634618560.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb9e59411607003cd164f21b18bda47/dazemivurefukomivijugaj.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/43600470158.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/66157541601.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903155914.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/weledagejozosivanivado.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910080103.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/8521707670.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/9083629714.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/84827263884.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xurebileja.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2424de2de7c0e60698f17801abe7d861/14552982988.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210912114506.pdfIn PDF document text
    • http://devveb.net/userfiles/file/36004784900.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/tedaf.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_off0000c228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC228 16308 bytes
SHA-256: a56be7ba5c7a6d01b365c28d1f1c01324106104f6409340b75e89cd929da1e2b
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 10300 bytes
SHA-256: de2070a9de8724a50ba1cb16c80f5df36069614a112f29eae8e3d91084d5cca4