Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc24cf37f4c51275…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 13:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c4f3c580b05057f1a95f8dafd966aba SHA-1: 8938489bc8d55daa48a1cf12b517a66328bfdd03 SHA-256: cc24cf37f4c51275e986eaf1f02aa5ec6df0709aad8d24c2f8503edad635eca3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript further supports its use as an attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5d5c9ea7---lojatovofajatenobatotubav.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/92156177377.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/21322194586.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/xiparivig.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/5dbd76b9ef8ec72847ceee23edc63f16/5528270417.pdfIn PDF document text
    • http://esistore.be/userfiles/file/80503246651.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/bomevomawovusew.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/30319889812.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/baduluro.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/girikakumiximasute.pdfIn PDF document text
    • http://jcpingie.be/public/files/46501414964.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/345dq0qfvt7134o0cg3seqsbq0/21788113155.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16235619169757.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/188f3556aac0bf6e11dbbfea63b10ab0/narin.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/48249719136.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a35ecbd47fe428074db12d321e06b47b/16234253482.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5af282c0a2---kufiroxirilotadasabufi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/341472c87d23c5e8e3c1d5dc97d877d5/besekalobex.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/98958683501.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/38948682020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aston+martin+vantage+v12s+manual+for+salePDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10876 bytes
SHA-256: b39d1ea643f1074554893ea994190e8e6b1992ff3a37b943987c33ec5301a38b
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 18584 bytes
SHA-256: 8cd5db313be72015d16f6a96b598ec7500fbc1486a5d485b9126612d4fdc8491
font_02_sfnt_off0001218b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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