Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c4eb05cf6d4977…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d62dfec00d92b0c88cd0092eb3b90b2e SHA-1: 0c3d38de5d1a205e85ed41e7e30f80989273690d SHA-256: a6c4eb05cf6d497702d7ca3e4152ae0cc0c427568dbe92a8b7f4e25f052041a8
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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://veaodaibrahma.com/uploads/image/files/20485848854.pdf In PDF document text
    • https://pellevah.com/upload/files/todot.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210903145709.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/39798653394.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210907/file/zuzuzimuw.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/boxurepojanaxone.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c7f27a4a732a0764d7f11d7682fd2d55/33818638654.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/4741970108.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/17940232141.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/vinugolabepivugekef.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/46169294863.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/jeduxigibowo.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109041650566498.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2562e2593aa1bd2b142453409d28c070/61842737500.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8891662e5---60222989896.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/67886016454.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851cae45f3---lepeniliremenede.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/rilanuwomixirenibagipopol.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/wemefoneroz.pdfIn PDF document text
    • https://beltamas.by/content/Files/pimovitato.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/18748243901.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/38304810065.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/didasazaliwavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=13377x+proxy+ofPDF link annotation
    • 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_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 9940 bytes
SHA-256: 50f2c285dd3f97494f76c6bcdb2203a35e123c76c648791cf6dcbfaac769c42f

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