Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41f1eb975e1b13…

MALICIOUS

PDF

100.8 KB Created: 2021-09-18 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ec86226cfdcf352b057fdebffa5a3bc SHA-1: 96822777c6181a668ab6c71a32cc9f927263bc0a SHA-256: 6f41f1eb975e1b13a1f6a30a70b3276b579155811c29dc3b564b2cc861f00d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://medvor.ru/uplcv?utm_term=short+story+exercises+pdf PDF link annotation
    • http://yishiweb.com/upfiles/files/20210908_091830.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/71913029496.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/vinusogewanovosipenanexer.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/kepibizasebedutowokejarom.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/36425717998.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f606934fd6---57583620176.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/gopidekujekad.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xerujosulusigejumasiz.pdfIn PDF document text
    • http://e-menu.hu/editor_up/69953063288.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/846425314.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/vojutomel.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/jaxubafezijub.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/41511531177.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03febefee---76497873897.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dutafalosidasivosaz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172038276735.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/41688780592.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/pisorasovem.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c762ee06e---poresapirutomutowariliwi.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/nowuwibisipode.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • http://thepducphat.com/upload/files/pidixotikifesufaz.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040914554599.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133b461624cd---janimotopelosepigab.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/43130259423.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_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 10696 bytes
SHA-256: 76a351cf482aae061b53001327a52f7ec4695dc5fe376df8b6fefb68e4e441e4
font_01_sfnt_off00013d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D60 18720 bytes
SHA-256: 01ff8aacf7fbab0cbc4b1801691b6058e96fbf2b06d172260aa68fcfad65ca43
font_02_sfnt_off00016de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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