Malicious PDF — malware analysis report

Static analysis result for SHA-256 0325289eab1aa5bf…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 17:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 702ee818ec5c32c942e1463fc0c54e67 SHA-1: 4e02d662fdc7c9eacfa12f7ac40029b8d5db4558 SHA-256: 0325289eab1aa5bf30f4a18a2144bec3964df4655e3ff70fb0a6c1a4efa01fc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://medizator.ru/ckfinder/userfiles/files/nabipolopiruledupenosef.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tigenu.pdfIn PDF document text
    • https://iword.de/userfiles/file/xupixilo.pdfIn PDF document text
    • https://socardan.com/userfiles/files/55796434617.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/nowatokonewometif.pdfIn PDF document text
    • http://theponghop.com/upload/files/45123511760.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_B8E8FF57C1FB96C7.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/30130219433.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/64424990109.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/56738383091.pdfIn PDF document text
    • http://vuason.vn/upload/files/4002979077.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/nalorujopakoposub.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/22060406922.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ea3f1e5ccf53195df148fa3b74203a2b/43392383821.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mizapepileradivofaxamipi.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/wudoxekevober.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161313aebeff9c---10717263503.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/lakup.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/dosudomuzadutizeko.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/48797401397.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f39200654---tozukejinetaka.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/sefin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+get+apps+downloadPDF 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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 16728 bytes
SHA-256: d8a7237537527fa7b6bc380acef5e395ceb7a4dfba995cdd679b73b7f2c3afe9
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10768 bytes
SHA-256: 02cd932638c6deb35cfb36f8b41c8646bf8ea72f8afcc9c86b5d3386c4ccbda7
font_02_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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