Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a2e3b6960fce22…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 04:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b51d875cc042ea755c92eeb168932d3 SHA-1: 3772be7416e726dfc79d005c765f6fc6632326da SHA-256: 40a2e3b6960fce22a40b9d8a71e6d064087734a587105e0fbdc1485ffc632e3a
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malicious content. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 5

  • 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
  • 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://travelbilet.ru/sites/default/files/file/foxerum.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juroxuji.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/26087017748.pdfIn PDF document text
    • http://liyangah.com/Upload/file/waniwawunomubazigob.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/meehpf31du6vrpfit3hsggp749/gelogure.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/vewoxovituzifuxifuvaj.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/6589511325.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/95472316613.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/15679415384.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea0e2dd745e736343d28e5538151c349/sulagusuludu.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/27219323832.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/57780108380.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/1677568042.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/27322061970.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/25483577282.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2c4304e7de057be67f9f7bc90d7f745a/vixobuvefozaje.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/zogawe.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/viraxodapiw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc0adafc3---73965590389.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wivuroseserakopor.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/pojepupojidoronolevef.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda5d7c1fb---dubuzikekewasoneboku.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210902_3EF09C9171EC05B8.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/tevelijiwomonezokupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bookworm+adventures+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 20868 bytes
SHA-256: fc2d9868da08e5f797c18bac987d1d4ae5dea6cc56919d4abb0dfb4e59c6bb58
font_01_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 10812 bytes
SHA-256: f023e00dddb6a292b30143bc431fee7557d4823f1b48b92b243b197d723c4214