Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2830a4edbf7e795…

MALICIOUS

PDF

71.7 KB Created: 2021-08-25 08:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc2bc6817903912899cae2a61f7737a4 SHA-1: 476229db22cb6de8adc2e7adf2ff3277ca152e50 SHA-256: b2830a4edbf7e795e82ca1293b9192c50f7583aafc562d13edb49173cbfb59e0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

Heuristics 5

  • 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
  • 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://mzr-avocats.com/buddha/ckfinder/userfiles/files/zasisubuwodidosuzeru.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/70775088530.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f9eoe8ng2dpfokmn4elh5vabgc/74089385756.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/lenozivututoni.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/71338048494.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/36270909510.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/12966270261.pdfIn PDF document text
    • https://proxus.nl/file/gonipiguxiwepebenodijaxul.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/nolupu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/86924937118.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe551bcb45---fewuwibibuduzodogu.pdfIn PDF document text
    • http://capital96.com/userfiles/file/bokimaturulozubamukur.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64150585401.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0a2ec2711c3d602f46de192f21291d0e/nizered.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/66044657894.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/rixev.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/93345759375.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/615e79345abd4df2f6878a6a8c4c3868/rebivogumiruwajodibi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rv3c0pgdes2rogsr01c7mrn314/35178756389.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/forusitezudosideza.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/92187e27917bb38238b3d18be5da08c1/94518437342.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/49493833205.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/bifidomorizajij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+stop+getting+spam+textsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 16864 bytes
SHA-256: e201a7f00190d3d438f096e783a9b3939a4193b894fb1386b29069a66c69b239

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