Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8256dee2e62bb04…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 11:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7488c28b874b6a4e13cc93a1d79e849 SHA-1: edf675481b1683ce8bc4122cf86fb50fa5d77038 SHA-256: f8256dee2e62bb047dd28fff7f023e513be7012477099156fd207f517ce2f835
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm on disposable hosting, a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://usefchina.com/uploadfile/file///2021090604305658.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135093820bfc---17884719542.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54618314819.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6aad362daced46e957a449b0eb5c7cb/47359922165.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/4391321480.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6efa34d5c---kubejixonexulareneduv.pdfIn PDF document text
    • https://bursac.net/userfiles/file/23858544316.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/73603779180.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/bagadi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/36989404615.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/timatemimedewowunuz.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/3919036670.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/vamofosupe.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/4015436492.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/16725753864.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d2a200b41d260940d94f9c3ac1bfd457/suliwipurafegezor.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210914083057.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nemovemiwokerijugup.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d90d8399d---vojamibajofakezazadosizal.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2267eb7a---jevigusimagov.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/90745510880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=god+of+war+gba+romPDF 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 19248 bytes
SHA-256: c6251852653233c650a9046b138e2e9f7da27ead367ba92f99c2ceb964ba85b0
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 10324 bytes
SHA-256: f3ab764f8a91134254a5fcdeea9c5a0d98186344036861a1d0e3e3dc06348c91

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