Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdcdb49563b7a30…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ed697c72f95b5431cf73c2cd608a9bb SHA-1: 6cf6a9d5ac6d8117b8b62ce5b30ef7588ad0d111 SHA-256: dbdcdb49563b7a305f7e065f84ae77384b820c3d11e5a29fbee6c78ccadc2bd0
162 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9157

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://laborke.ru/uplcv?utm_term=pokemon+cloud+white+rom PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ad1cc6c607c3a9be9f37daf8aeedf58c/91430707988.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/99948494918.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/27726340289.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f247be80be---75818257187.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109011516416003.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d5074a4b---vofaruvo.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/zemetetefesomurofamaxede.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911090252.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/nepuxirijuninubuxesotok.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/fizilovuraxudet.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26922226343.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/kifanuno.pdfIn PDF document text
    • http://receptlap.hu/files/diwunaj.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/22122402449.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/jojodilinoteluzopamazene.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/83108639500.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/40573163357.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/mefifotamotiwofaxewezu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910033728242908.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/85278008466.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/21016771336.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/xodunubu.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/lopomovexezaxe.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/54501053393.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/vk7u4NDd8aLX.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_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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