Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edff6bfcdf8021e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 19:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb258ffb87b075da086ae419775136cf SHA-1: ce52a331f9340663c246010e20faf7050c83e561 SHA-256: 5edff6bfcdf8021e3e45a0c2a88778a6d849c6ec3284b454fa64ce2315504f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bbpartner.cz/userfiles/file/sivokewun.pdf In PDF document text
    • http://epoxidice.ro/mm/file/71361879771.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/jigasisadizekelunovopeme.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9e23f803---jetenopobu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632304be8d---zizomutelimuzemugipiw.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fajakugofew.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/vetuzojeremijomupivexu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7bba0837a---lipawawugijoputotugese.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/48957244544.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2c765304---50562977363.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/35586650390.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ce9e0104f89658687d2d39d51e2d076a/89190423310.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/cjdudr42jj1shcdeqrr1jsrknt/puvasew.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/97038738566.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210730185119.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/7013165645.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/lotunesewenaxu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/33837709586.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sesn0ti2qhqijp9bo48orutdq1/ramezixerakozokazen.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/xefineximovovu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd1e68467---47857432689.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4ed489243---3090245851.pdfIn PDF document text
    • https://everestart.com/images/stories/file/35739885040.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/juson.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/jovixajapifaralajiditi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=christmas+carols+pdf+freePDF 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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 18544 bytes
SHA-256: 98b42bf9ec6ef70a7b5335d8e7e0363b6e96df1a7bcfe42bd1b6f27af0fa8ea1
font_01_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 10812 bytes
SHA-256: 5f99e91e318c18f0a2393079c481d81ad58e0e954cf93ef5dc526f180db5f5d7
font_02_sfnt_off0001405f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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