Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6e42c652043531…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 05:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e1d378e52dd00820f9b87811c8e9c14 SHA-1: c6347c6a30bf6ea529c3af660d545371f537d423 SHA-256: ca6e42c6520435317115b3ab38b80e014c2f41f69150ca4fe9b66303672c4ede
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/64904571230.pdf In PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/42953884772.pdfIn PDF document text
    • http://talleresjpg.es/img/file/29151539299.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614129f58353c---36683460826.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613356fc9b51e---83258747130.pdfIn PDF document text
    • http://fgosvo.ru/files/files/25204880650.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/lezerifekefizu.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/44217751045.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141402a23a7d---vexegotuvegoduzomirovevo.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/rumiwuxibiborenafegir.pdfIn PDF document text
    • https://cakkue.com/contents/files/mexuzokezewon.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8d743c6ba46c7d938b7578ae1dece7df/pojijaxexunoduvedilupur.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/89158886640.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/73033722625.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/71230960937.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/40260158140.pdfIn PDF document text
    • https://kermanrooz.com/img/files/7946614206.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/89224151895.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/74430350087.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nonigebotijuwasotiz.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/dawor.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lelajilobukusarebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+the+snyder+cut+online+freePDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 18456 bytes
SHA-256: 1c771ec79c415ccc4593923578c5dc672933a8a55a991b08903a6acc5aa5608a
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 10780 bytes
SHA-256: ff87db35c297a1f1e54fefbbac7f7908aa373911d57f97884a90bc06779c5fe2

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