Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f791f50e4256b0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 15:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cf99ba39d7cd16bc9b3501991c25e92 SHA-1: bc052f2e1ef2d90f8276d46cd727d073b5701b40 SHA-256: 96f791f50e4256b03081f30722e66e7d2e4926205228ad780735b8885a91cb06
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic findings strongly indicate an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=how+to+change+vpn+in+android+mobile PDF link annotation
    • http://intertribo.sk/files/daposadebedanosugu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b067d0270f---54745875585.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/mipovapawirulem.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/wazasisesef.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/finijujujubev.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d1634f3e1747c77e26eab9bd4cadb202/winubuliv.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/lobawekifekamiso.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/womelavewovikinubotu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/savamawomugekis.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kexivowimopom.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/judipeju.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fodamumapuxuwaxuw.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/fudazipumogufenuwimunalo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/48716909851.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/tediwexasev.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/45451480870.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/49033603649.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/gokesejomazasozebiwuvarix.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/92535101785.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902083617.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/momof.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 11076 bytes
SHA-256: c5f2ea5c38a68b3485ec9343c4bb0f08a33471582ae5a85976663131548be8b2
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 17700 bytes
SHA-256: e8d7faf3ed9b014b5f934e0e160172bedbb80d0d3f0fc51474b4df1ec3cf75a1