Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b62669a36b97c1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 17:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8334763ece99467703f842347ba988b SHA-1: ce2bde92ed732c8ae268ef71831ae728d4461c9a SHA-256: 36b62669a36b97c1ef5ad19ed57d6a3ace6f12274bb24e3dcefd093dcc682833
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://martan.es/cenavarra_userfiles/files/41426502483.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43445107906.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/rugodawopunogeluxetubiwor.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc47670f8c---94986828662.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/46952081656.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/48950252602.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/20531133991.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vumonikiwumorug.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/surekibonididozugipago.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2d4b53db6918f588667faab2f698339b/wopofakebi.pdfIn PDF document text
    • http://julianina.de/upload/file/rabiwolelujupi.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/talanetemupozoge.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/5295784306.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9010d5506---91858209254.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hk9m8kdnupepmbouupjk21o5s1/ninizawijena.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/gekewitofunekupenudogav.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/25827522389.pdfIn PDF document text
    • http://halaljones.com/uploads/files/90404802270.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/femelis.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a4e68959983da9276e6f9713629d141b/vovatibotates.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/wajedofegupedononabon.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904073018.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40031987365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+mobile+video+recording+appPDF 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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 16020 bytes
SHA-256: 262f0b0099e2eec743d8de24ada5721d5f5cf406d975686bdbccea0f07ffaa2a
font_01_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 11116 bytes
SHA-256: fb476f4082c44d331029366dbe48a56c00f895f4128cadf099b3a6878896c304

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