Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a4aa95df95d96d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 13:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e4db6cc0f0f9eae832f3c43a1bdf188 SHA-1: 68cb9705d8662d0dd378ad7971ceb34eb08d7477 SHA-256: 79a4aa95df95d96df09e8197e95c94a8056e5888cfcbfc4088384f1f46314695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://greddy.com/admin/common/ckfinder/userfiles/File/5763508801.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c77669a3d220de8cd6a59cfd93bb6dbd/12198311191.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce06d3fb2---44196129392.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0848154ec---puxora.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb0bd19fd---51452719871.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c2deeac1b24d0b612a890f8161ef0bd/72618786281.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe08f3699---22533456269.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/50214027238.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeba17f16e---63232505331.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/44281336445.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f999d5083b1---52171775337.pdfIn PDF document text
    • http://shosholoza.de/file/pogifamezajovumelizemomi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kusivodexedobaxivifujo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/947ce1bef4b1b39baea121fdfb6beeba/xavupudulozamedaf.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gaguzomaboratibu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/bodigakozazepomifa.pdfIn PDF document text
    • http://fedime.org/imagenes/guvebof.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c29f9cae4---72273253103.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8c4276a1---jelovujopoteniretejitep.pdfIn PDF document text
    • https://bamor.org/userfiles/file/naguzube.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/56266911577.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160857676450e6---32735774509.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/538510234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hereditariedade+e+o+meio+ambiente+pdfPDF 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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 22160 bytes
SHA-256: 9b97f1c5420ceaf1625125e72d23368285a7d4d45317a8648c8df6936c84a89e
font_01_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13066 10576 bytes
SHA-256: 5a0eeb083a03eaf290fede07ae663df1088da3bb754981009ec80c28ecbbbeea

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