Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4d24814759fb56…

MALICIOUS

PDF

76.1 KB Created: 2021-08-24 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1591a18bcbc31290c2ec76b4d9ca5e5e SHA-1: b1f5e50e44249bc11ae5694771398581ad819c43 SHA-256: 6d4d24814759fb563c21e19af97f099795181d0d10b77839f402c9adb8885a34
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule indicate a pattern of redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://laborke.ru/uplcv?utm_term=can+i+embed+video+in+a+pdf PDF link annotation
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/75c04680d1bf245e3cf6c13e4d39e557/sisujoridojelivalapus.pdfIn PDF document text
    • https://majubesar.org/contents//files/terelu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vcu6k4cb9p43abs7hbgljnc681/kinukipopijojipep.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80c596f931---15107927686.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809424c2513---pekabagolosefa.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/fewexufum.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/6239662688.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/55072573278.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3e415c17b0062f98ab74695bc649577d/daxalekire.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210514/file/16209675108495.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1686fbd964---59690049548.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607817842fc63---jukibuxadakokogekuzus.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/20021048518.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/totomunopozipivew.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f389dff---47871595625.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c78970fb8---62302024293.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/54082124430.pdfIn PDF document text
    • http://prota.ru/upload/files/17502223540.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082510475004---zimuladabejotutopufudoso.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sonugemawugevijulad.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7261476d---1550276677.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/3556272544.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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10484 bytes
SHA-256: 8f9e7439dafcdd571af8170b9302262701e5751102740fbb5a0ec6cff1d48b4e
font_01_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16188 bytes
SHA-256: 4b6bf35bf43f8e669cc62de9ba36a74bf930dee7a94037b3c3633adb13c8dfa5
font_02_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.