Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f131173d4950d4…

MALICIOUS

PDF

55.4 KB Created: 2021-09-15 10:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78057e9e0379fa65e41d8a5cc2f64033 SHA-1: 969727dcf1374b035ef2e002641748d7c18657e2 SHA-256: a3f131173d4950d4c8f3afac978c3bdd3b8ee64032daf0f4a4a5e7371a67babb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7076

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://pixomot.ru/uplcv?utm_term=cost+of+galaxy+s+21 PDF link annotation
    • http://dagmare.de/userfiles/file/dakegeted.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jakufodotudasonudo.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_EB73B2491D0A3947.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110944497928.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/55jq1i2v7lp94nbpgruclgv4jc/kupuravigivudaniwugekof.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/ditexuwurafolagebatunoxik.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/80363567390.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xefesafonefizujaxa.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/rabetunanuxesoxarefek.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/fd92d116c3aa1659dd8952045990c737/tepatodo.pdfIn PDF document text
    • https://finliz.lt/i/File/kogulavafoxofimema.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/nadiwafuzurirop.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/37130762519.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/74294643870.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131281e486ac---24884460175.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/bolonifufejefagovirego.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/lixasin.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tulofifepal.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/nubewekifugolujexel.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/silukosaribesigunobavi.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/gabepa.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20995242846.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 10380 bytes
SHA-256: aacc3be9efc023ac0c14a9b1c1c6ad9676b542e47a4935c2dda80ab62bf8e9f6

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