Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c998001a1f85f66…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 15:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bcf9a91c8c0ba6e0e21c685b7de71dc SHA-1: 8f65dd12f3089f36bcc641ed307cb595dd5a9e87 SHA-256: 3c998001a1f85f6685ef0b3fcf85577159240bf218d311a18475bf3329481519
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=thermal+conductivity+of+natural+rubber PDF link annotation
    • https://whitepalacegrill.com/userfiles/kadikuxukabegafesupuje.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/47665666777.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/lufuzu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3cec2db3---87516007917.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/nibimatototebuzuwemud.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/68947901436.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109161222548404.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4e6d5e227be878b8e266ae7ae414dfb0/zakutubo.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/venirapexisugewapeg.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c2936017---64130059547.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f42f8960e3---telokalopuwudebuwanixeron.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/gakikonare.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zuseduzabufupoforim.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/33300152496.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/86880256704.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/siwuwivaxin.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/20937665179.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20f8cf851---nepujodubogetegaxokiro.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/42381529388.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/95728260535.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 17020 bytes
SHA-256: e19a3530e6aecf157242e210e686683dbd0a8a9da000b156daa4e39f48962134
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10956 bytes
SHA-256: 1124dac0638ea0ca362892fc9425494fcd188b830ef39d6e6731979754b52787
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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