Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5b38dda7d94735…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 18:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e2bcc530bdeead5774200251169af04 SHA-1: 6f8a50ba601183a4563938750a774aaa31b44a81 SHA-256: 6c5b38dda7d947358b51044d24bb574efce981c97bd4d684a4a96af4e1d98a89
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dermatologie-chamonix.com/userfiles/file/wibovaxano.pdf In PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-17/b1dac6e7754ad975613fd9315524e05f.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/94530342975.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb86b025aa---sakosibasu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d88048204---14907254752.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2886c4487a0cd71a8599560fc697df8/27586635709.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6uacpidabt0in887jti81ph9b3/85657489373.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kukorutob.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zited.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/3664818168.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sgl3dej47iiokghrogigjiukd0/vetagosuvi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mhgdpfkkvj4mf5dnr4tc66pvil/41445604649.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/86931038947.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/zuzusukulozegogizibev.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/86165894408.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/75984574513.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/28365074817.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/sugurabunarobipumifu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7da3894d0286632ba40225fb44dcd70b/11767099751.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/45298773181.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da96ed4e18---36581060196.pdfIn PDF document text
    • https://go.bestbookbits.com/freepdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+leader+in+you+dale+carnegie+pdf+free+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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10896 bytes
SHA-256: b802a3330441eaa6887efbe2bc049eead53d34b5cca33c81450eb674c542f539
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 19688 bytes
SHA-256: 1b0d11cb285e36658fff77005d7de2d705b22f630da28bfcffa7372f3a6f83e3
font_02_sfnt_off000144a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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