Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0eb51b3a5c1f781…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3e3f91ef254f970a80472be67eddcec SHA-1: e5ae8a7160a8e5dc07393eef1108ef6d2558ce62 SHA-256: c0eb51b3a5c1f78125422c3160f7e3c2a3caecbbc66f4c9bc07626125c53455d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is unreadable, but the heuristics and URL analysis confirm a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.hgekc.com/media/userfiles/file/pulurorozurevinuma.pdf In PDF document text
    • http://hdurmuslar.com/images_upload/files/xapivo.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/japufuzutolene.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/nasoxomitam.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/29055170955.pdfIn PDF document text
    • https://mackbeks.com/files/file/5111116489.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xefivixizo.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/35630833851.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29138be758d91f8c31343c8a7fe8fa7e/lufakonavarazewabasite.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/lezaxutupu.pdfIn PDF document text
    • https://cardolf.ro/files/fokugujavuget.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8cc02044---vezagipo.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/lumatezaz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139088437bcb---fowibuvonekimovebobinikir.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/67968679763.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/11147176264.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def64383e3---91028310145.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/26807660058.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/9453530215.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/safisobefukuk.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/lowekepug.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/29241177849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=a+fantastic+woman+full+movie+with+english+subtitlesPDF 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_off0000ae37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE37 16108 bytes
SHA-256: 7b9c13286e9b680249f3045f315aef1f6ed3178b4d2e58a4297071f7a607d3d2
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 11056 bytes
SHA-256: 0c526502f5bd73ae457b52247d79fc67296ee5375f22bf255f3fc92461cef0de
font_02_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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