Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cce01a66aedaf2d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c74ae8798f41c092111809c72f0d162d SHA-1: b6fb893c0f34e07034a4fda0b351a7a1320e2dc8 SHA-256: 3cce01a66aedaf2dc25db785e7f6d3ef8aedc47b451f673578ec4d4a214b7fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The PDF contains numerous embedded URLs, suggesting an attempt to redirect users to potentially malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ed7b39a3---gofat.pdf In PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/viwoliwos.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/vavanunategefadoxok.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/46964983360.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/soporalaja.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5d45a954---nutumoxumi.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wujefuj.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/boxivekurago.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/nokeronew.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lejufaloranuxapixodolizi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/261079d4ee3535aa2e86f8e6d8330a85/2955118363.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80330397602.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/77578221487.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085e1204b72f---metajova.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/32905075007.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa71a9c8c---gumamemuraxev.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/58214893011.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be8aa4b6aba---dagivapa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/958106210.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/n8a9gv63m9h4itaau2rblat7jr/62146519754.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f69fb4ee048d4daaf82541754451d44a/dododadafukexulosoko.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5600a0370---xenawozotudijafebar.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720c42b0747---31183316049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=leptospirosis+pdf+%E0%B8%84%E0%B8%B7%E0%B8%ADPDF 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_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 21632 bytes
SHA-256: 5945f14ee4429fa281e2417732f916511e40b05e4ae3655b0799d1cb55d7aad2
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 10136 bytes
SHA-256: 2320ee13e3171e11a73396f36a5ceac1f0d1cbbea1163735b5d5ed3d4dcd66fe

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