Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d0fafb72b2c7b1…

MALICIOUS

PDF

143.6 KB Created: 2021-09-04 17:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 152429fc08533f83f52de6ea28c9dfe4 SHA-1: 898a02962e310a333d34bc97c4dedc04690c74aa SHA-256: 88d0fafb72b2c7b1e1d78264a09d9d5aa6512dfddb7ec85f5a2599033cf1d738
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9099

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 https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c728bcec5---12910404021.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/45048099639.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108141624454118.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/51112841067.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82403264723.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c845d2ecf298180baf9ce6333ba9d96/sesomamoduji.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/79507857728.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02d79a11c---zabijutezusilipuvupu.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/28538764259.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tahlg6ms1ib7oht78aqqq1rns7/pidalajim.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7974f3e91c---53669680304.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/94230808216.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83409593711.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/sotakorakatuwozot.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/92151051465.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae6d681c5---jerogisiz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bd3e61368ec84e73edbcef190524ccb0/desopuwixegunejaxaroxub.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fessi7lr0sjs62teeqt3u5v54s/xatumamekedekezomagusirun.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e912746f---razexusevisoropij.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/soloperafodotarat.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e166b6dd---jatujebasilifudux.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f942413514---71121384631.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed860d7a012---61050849190.pdfIn PDF document text
    • https://langumeistras.lt/i/File/35257109878.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8ed028635fb5a4e7f7e36818f8df6f8a/dujoxudomalopedena.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/df4b7de095a9386d7c9b35e1001df27a/87742736803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=los+canones+de+dort+pdfPDF link annotation
    • 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_off0001d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5D0 10432 bytes
SHA-256: 9347adf16446427eab60f57672ec050195977ef5841d77bcc49241ecf8b4c593
font_01_sfnt_off0001ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000205b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205B0 20080 bytes
SHA-256: ad1ec1373384546896cd815bab6a68de9b56ebb82206f4d514e3494bf9895076

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