Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93d452c3849a32e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 02:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d31409a8ea703cc54e0c8426f818d1d SHA-1: b4d87c874fa5b4244df8aba3f0f21318ffb64627 SHA-256: b93d452c3849a32ecdd0d09411b66c3350ef4ae9e7a5a5ad9e06739448a292d7
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to prompt the user to install a browser extension or update. The document contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=dark+mode+for+every+website+chrome PDF link annotation
    • http://daisytalavera.com/userfiles/files/39590392035.pdfIn PDF document text
    • http://4darchitecture.org/img/all/vodefezo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/57072779176.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/43711506296.pdfIn PDF document text
    • http://kco.su/userfiles/file/tisigojelujanojuda.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/68165616939.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/96314122936.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/87485888618.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/24990870463.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/buziweduzenop.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/47565390678.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b7a847189---kewufekokuwowefele.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b77bb6f26---7769035987.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/levarerikopaz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146187c4ff57---lonof.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/netaxuloke.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5e6305d1---niruwamowofij.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a7d291e---27660013275.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lemisenip.pdfIn PDF document text
    • https://wsbtitan.com/images/file/67970983715.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138734a9844e---degugupepojajosulo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/13402198318.pdfIn PDF document text
    • 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 11092 bytes
SHA-256: 82d7a30518c9bef7ace2b6f36d3280ba9d45864cfcc514e6c10531418e2d06f5
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 18380 bytes
SHA-256: 57f454d7bddaa36b17b5af2e7387af7bb426bd6fb38797486ae937d4f670a01d

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