Malicious PDF — malware analysis report

Static analysis result for SHA-256 d982f00956787f02…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 138eb1819feb2a42e0ab563cac939410 SHA-1: c2e454d2ee4876205fea7bb0f12db305a7066f06 SHA-256: d982f00956787f02a212c1af82f1537a36674652c095f9536f609f853c87bccb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms to obscure the ultimate destination, likely for phishing or malware delivery. The embedded JavaScript stream further supports malicious intent, potentially for exploiting PDF vulnerabilities or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5479

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crysiq.ru/uplcv?utm_term=quimica+chang+goldsby+pdf PDF link annotation
    • http://theseadiaries.com/ckfinder/userfiles/files/38596062242.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/59088474931.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/palaf.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xabubukexewivaz.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109012111021350.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/xadeni.pdfIn PDF document text
    • http://gaudi.tw/upload/file/25066876374.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/32488022578.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210924010005.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wupukojinujeremopaka.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/xanilolikalugixiza.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b45ae6c8ad---69306324120.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/wodamelelexefanafibux.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e33bdc2b8---fipavelerenijomi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143f41fa9a2d---givolenis.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/59594786088.pdfIn PDF document text
    • https://designclarf.it/file/39143138859.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/lewazetoranekalem.pdfIn PDF document text
    • http://www.depomatrial.com/file/20581598491.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/72847880954.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zutunufebikuxifo.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/ravesazam.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/marud.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906020633.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/80188414735.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/vavolafokuradoberegewon.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 11148 bytes
SHA-256: 708bbe4c664f15bd6fd9f8257c42cf9eab3b8361fc45ef412298b6e75328ea7c

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