Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cee890c68ba3996…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 15:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 407b3c6843360bdf2af5c7585703cfc6 SHA-1: 4df8b8219475c5576f62b13f77110be92b787980 SHA-256: 3cee890c68ba3996c30fc2dd47b32a67252f41d20e1350fabb477c01e8ab5b37
132 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains for malicious purposes. The presence of these elements strongly indicates a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.2072

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608532584b7a9---kafukaxevugem.pdf In PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/76535960517.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf16980b39---pasesirekosiberevobebigiv.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2sfqna724abevakdt43ni8l7f9/nusegaku.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/xetal.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/80917106983.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121724fcb9b1---zekenezom.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/kajemilejebo.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/39122323646.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/lebaruwo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/gudopijipuwolelufafa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160785c802ea5b---64729921393.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/93151027704.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc3f88ef1---91698267705.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/63rp7s1b5ra7dc604jev4k5au3/74768508997.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf70e8f35---vatetulusasipatoruvozige.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c8563e31---91391875380.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c415fbc8665---69657019823.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4qdfs09c6v6uhmlk83c40lm74l/78940178875.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608110444d736---73108044063.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcd4da4ef---mopifuzufozal.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/df6ce801f84786f8ca8b76dc326e6e6b/barepaxiza.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e79136804952b4b68ee65cd6b6b38e6b/78298694428.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/suvulef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grade+1+printable+worksheets+in+afrikaansPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16208 bytes
SHA-256: fe07a9a976476de2feedb028ccba142b5134ec91f35c80b72117b793fa58d7a9
font_02_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 11004 bytes
SHA-256: bd73ff78f1b517de883ef92f510e20bf9d8dc9aaa3de7e79a6f5aba648917aa1

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