Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3fbf5c7ddffc72…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 23:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ad677633414b21427e84e3534266bbf SHA-1: e9d87723997fdbe7045c5c10037f07734f932447 SHA-256: bf3fbf5c7ddffc7259feaa2ae0987e293b601f32ba05f7af8513896b824f24b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The primary function appears to be redirecting users to phishing or malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=special+interest+group+worksheet+answers PDF link annotation
    • http://prochem.vn/images/uploads/files/nojalapis.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/72823293852.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5b0796d5---gugixop.pdfIn PDF document text
    • http://mlight.cz/archiv/file/6915282862.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160add8e2199ba---50678418533.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nobugaronupejibemukazis.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/62778711101.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/78291133320.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9193b60bd0ed02b2e7e884cd6fc72a3a/61870475686.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tajosa.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/49864153369.pdfIn PDF document text
    • http://apcmagon.com/userfiles/xineraviwiwosiximefara.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4296c9341c54bf93bd250b4a0c5ff20f/96625262874.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8786ed417---joparowenuvan.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff4ba7320---17777034406.pdfIn PDF document text
    • http://metabolit.ru/files/file/30252414360.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7e4819c1fadafec9ecdb2e3558a2a1a3/gegaravupowub.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/99252165244.pdfIn PDF document text
    • https://naves.cz/res/file/69109318565.pdfIn PDF document text
    • http://yepuco.com/uploads/files/20196531901.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/jaxilafinit.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/bubefobade.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e901e877eb---mukeguzinezono.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/12969328752.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/29573032024.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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 15004 bytes
SHA-256: 7d3504d58a7b351a0ed406a1be145d9d61449dcb6128be21622c29d1f9392043
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 11004 bytes
SHA-256: 8e394a581bbd6a6ea340a4d21b73a5d1d34608f64999fb192c32ec930715d72a

Open this report in the interactive analyzer, or submit your own file for analysis.