Malicious PDF — malware analysis report

Static analysis result for SHA-256 c816c130b110d0a7…

MALICIOUS

PDF

68.2 KB Created: 2021-09-15 19:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 401e885c0775ecf3472db83c9c69eb45 SHA-1: 27a6618c8f26b2558a6647784ebc5ed7c344a39b SHA-256: c816c130b110d0a7b8e4c62881f8bc5f2e7cec9ebd29939367d24a5f87f21257
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and a link farm indicates a phishing or social engineering attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokazoxabikulidiwepu.pdf In PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/3595775823.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/58901586972.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/41913117902.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/doxotiboxurubezuru.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/9418133047.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6182437777.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdc284c60---wavom.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/9511757434.pdfIn PDF document text
    • http://sro52.ru/uploads/files/duxireriwagawixon.pdfIn PDF document text
    • https://anjingliar.com/contents/files/89893022912.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912214551.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34493133573.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/14967557445.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zewiraburabolarabare.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/85916994917.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/davukar.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8565c25---fefitovo.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/65970614169.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/f175776706554e4e0135b214d7896dd5.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/43541836641.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/jabuxerituv.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/29696840944.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1nuh4gm2ah336vqoaefjeg4tp2/14935555705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+psiphon+for+androidPDF 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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 10452 bytes
SHA-256: 727cd3f198e40e20417317e9408ce4d7504a9b263e55265847b8670f52f6db83
font_02_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 14256 bytes
SHA-256: 226c57378c7cf803a2c941fbe5fd3fb0d569f066933e24395068805d2f269946