Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0714e2cb37a3af…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2491d7da7632b5b413aa9a13a5f7ec4e SHA-1: f723b1b17e1f28eccc01434fb8e5e523e6e1270b SHA-256: cb0714e2cb37a3af818a07bd72ed144f29252e5b15b517f86726261a0f6280aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious content, likely phishing pages or malware download sites. The embedded JavaScript may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://dodomacnosti.net/data/file/ripugunepuxusipevudatisol.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1sifv95npvqb6n0vrokgqina23/suvex.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1e2dba5e945481b98b9e77b46a458465/pegamadomonasemodofuduna.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/66704673431.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/83ec174f565f353403d0267aacf27752/44861569288.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/66540346495.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2116259e0---fikezujigikidigawukax.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/50977554350.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608b748832dd0---xepamak.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/valokonawusezibaxajita.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/gepililuseg.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/307b7869ca53aa599fff5112bc7e695e/ruropu.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/vizupivafawer.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u5o1bb8pued9jk0qtc1qadsr27/9285026873.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vuwilutuderop.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b916a8aa1d---viverexekajedob.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/8464620200.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec6a85510---ropenojoxezaripi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/68123709627.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955789d58f---kilakatakevifaj.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/66751000015.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/gozoxidivasuzez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beebf99c982---75278346137.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6ec6974853f50768efc5746e33dedf2/27349853067.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/52e42e428511a15c0f73588dd187526d/5774679721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=instrumentation+in+oil+and+gas+industry+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 2380 bytes
SHA-256: 80e149ade39ee9be11c2854c119d0e456fb0f40c1f4e5f3f294b25231f1216c5
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 11004 bytes
SHA-256: 572f99e293ff51db3cce386d60dd23de5d0c4e42f42a2689147005a137adcc3f
font_02_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 17720 bytes
SHA-256: 22aaf543506197843a10822af9b3ae940347b6a3d18966e8542a8bbc5ee428a1
font_03_sfnt_off0001497d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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