Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c8bef5a16863a3…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f54d035c9fef99944593b5651f21a013 SHA-1: 4fc09e075ac899bce42d9880bf8c238b26f05796 SHA-256: 70c8bef5a16863a3dd52001cbcfb8e791ceddd218262d2c7a9395da0fe8242c2
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://citra.cl/userfiles/file/geterazigefifuwa.pdf In PDF document text
    • http://eotp.info/sites/default/files/fck/file/48718050501.pdfIn PDF document text
    • http://esangsok.com/upfile/files/70102321715.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/weboputoradebi.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/35814192075.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vifuvi.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/29377359757.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/fofajigojijo.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/64288410990.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/buxixijevinilax.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5358a3f6---78822677495.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fdfa3f8f90d0534874c0c46b44e81ef4/tamukuxidadinefivakar.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/429668809613168a95ec09.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/58239694699.pdfIn PDF document text
    • https://vitanov.rs/files/wokakivagupodebomaze.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134DEA20F34D.pdfIn PDF document text
    • http://intertravel.hu/_user/file/10424305288.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/vamanoniganoxokojiremo.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/92022242765.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/62960021432.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/64591664945.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/789024ac6f02cfaad270295c52e20809/zowufoniku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vidogram+free+downloadPDF 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_off0000cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 17244 bytes
SHA-256: c374e86cd7ed21c7f3e03105ab22f2e9d832324354f19be29b16ddde00c669c9
font_02_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10484 bytes
SHA-256: aeb180f3d73e7ad2424f1faf5eb1ee38c54321ad879c226560520ef685857473