Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cc2a4ca028727…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 609ef95cb7b15d30dd771e11d05c447b SHA-1: 669dffd3484b4159087e997210ca95f7f6569f0d SHA-256: 2f3cc2a4ca028727e9138a000f11de6614ca504323593ce4bf7cd61a2c684802
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cevhertemizlik.com/userfiles/files/lifoparimul.pdf
    • http://kameleonhastanc.hu/files/file/dozilizewafinumotuw.pdf
    • http://childconnect.com/swi/fckfiles/file/77208356957.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/85001534832.pdf
    • http://cen7dias.es/userfiles/files/49248950874.pdf
    • http://tucholainfo.pl/userfiles/file/36667670818.pdf
    • http://travellerisland.com/files/nevelajoveniwegom.pdf
    • http://gpp300.fr/userfiles/file/80332929759.pdf
    • http://news-hk.net/uploadfile/file///voxanoxagogidibuxox.pdf
    • https://airflow-skateboards.com/userfiles/files/23905171137.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/bapogewogufunufunev.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/wopowixegu.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patulo.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a33158b79b6172e719d93ac817e986f/59606169874.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8538cba9---45728618743.pdf
    • https://tyeetomsfishing.com/userfiles/file/fumasupowiwuw.pdf
    • http://zuche0551.com/upload/file/wilatu.pdf
    • http://mcap.cz/images/uploadedimages/file/fojesixos.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0107a499---15934830960.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/nb51eg8a9enihc35j0gebk4o04/80945156347.pdf
    • https://angelsforwarriors.org/userfiles/files/16479347303.pdf
    • https://ddnepal.com/assets/userfiles/files/tivavifetekopuxuzikepad.pdf
    • https://hotelite.in/userfiles/file/57554863192.pdf
    • http://benthanhsgfarm.com/images/uploads/files/xikudaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=visual+design+elements+and+principles+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
font_01_sfnt_off000111d0.bin
ae3acb972f01279b99c17176bb0d69ad8fe9ea71dc59eaf44089042cad23149b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 10912 bytes
font_02_sfnt_off00012acf.bin
9490e9cf803e057ee98df7a061f06536e10595dff43e878a11157f103ad9fdbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 18344 bytes