Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e3c58c851c7b04…

MALICIOUS

PDF

94.5 KB Created: 2021-09-11 17:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40d5a951e61e5107cdc8d0844e1773b3 SHA-1: 74599d3aaf1f6e1762bcf57fb773651d30dff47a SHA-256: c0e3c58c851c7b048185d0ef4e33bf3a67107bb66338735be3cb2a3c3d9ba3fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, often with UTM parameters, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://queure.ru/uplcv?utm_term=wilson+parking+fines PDF link annotation
    • https://chinese-wall.tw/upload/files/xisirawukuxinoxiw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/64305649612.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/39930646907.pdfIn PDF document text
    • https://goodline.by/userfiles/file/87262626442.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/54341193660.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/fodatibapiribiwuv.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/61621614813.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/tepuwoxibiro.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/gulenigubog.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zaduge.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/81144260163.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/kodupolajogasawobuz.pdfIn PDF document text
    • http://dfanchem.com/upload/files/fusufugilakefik.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e83685ccf---91494030973.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ac28cfa497e1e43ff284e1f7bf1c758b/59398934244.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/fuwob.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83661ac8a---zuwatofagamufogedakilisom.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zamelilisikep.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/forotenetuwalamobejobegaw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/wafuzegazinedilebasa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9db1033---mekavapaburepixuji.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/pifirotojitog.pdfIn PDF document text
    • 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_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 19336 bytes
SHA-256: 69dd32aae0607d31dbb497662ce7e83db403e2e2ce32925a20d6455fd0e329c7
font_01_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15485 10520 bytes
SHA-256: f5912222f3941d331fe16d5027655e0e8bfaa9c403e9d2a136853ec7103f661d

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