Malicious PDF — malware analysis report

Static analysis result for SHA-256 2622bfde2e5ff008…

MALICIOUS

PDF

64.0 KB Created: 2021-09-21 15:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bc4def7951826e4875eadb1b5b302d5 SHA-1: 0e2a3fd031a4e40de8956f72635683f6a2926d69 SHA-256: 2622bfde2e5ff008bfccc4d9f5346876e06ac7f5ce1c52122c5297b40ea87f12
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many hosted on compromised or disposable domains, suggest a link farm designed to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier further support the malicious nature of this file, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8566

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://drafthe.ru/uplcv?utm_term=chromosome+end+part+is+called PDF link annotation
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/50069752196.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/129fb7aa7ee6aef177a453b2635d0093/98411159817.pdfIn PDF document text
    • http://brukbet.com/user_images/file/nopiforuze.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tiluken.pdfIn PDF document text
    • https://okazionche.com/files/29634676629.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/88651674132.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mapifomokobaxe.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/95871801876.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/48443018258.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wisukulojijubisi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b777e3d8a0---givevi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/medimategujiletijodekubu.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/26672279667.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aff2f0a---7575977149.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f733cea6d1---fisifamofab.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc19c3008---95832286648.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/somosipexusesomiwal.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/28478281012.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xinapujadidenakewi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/sapovob.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruribivaxeti.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021951835279657.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/54526429082.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/wapewinit.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/boripurivuxepuwedokafupux.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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