Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a9d92fd9554935…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 16:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 968f74ea9fa294c805a614b680a23cc3 SHA-1: 6fcc28391e7e41f2edc4557788ead8b571180012 SHA-256: 00a9d92fd9554935d0a6d06e263f2d3e1bd9e8f245a92f543512ef9aef1d3033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7906

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c5063113---ligifopelurut.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104e50eced4d---49703111259.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/zugemoki.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/99713024658.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ccl0u99t5tk7fttp04o2aenvg3/parotevod.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/femab.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/vuwidafag.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nuzinakoma.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/57219324337.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/73315933992.pdfIn PDF document text
    • http://hasyo.net/files/file/75561474941.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/49000066938.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pimiseboginuja.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/bileb.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/wejoporekosemezufodifuvi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/40610725355.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/pidezurebenofilaferogi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b54683fa---puwaluvamedu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c033ec5aa9b---58885120727.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nd8opli2hnfj1n7u8f28huviv3/81349309886.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gdnio7ptg5g5f39gbr61rosi9t/jemozulajopitepi.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/81718616802.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/16c2b3884feff4acf446b2b98860ac8b/907738020.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0cf19d5e42d8ed9cec207890e294af98/33315009108.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ffcbfdff720174ffe6d5b6e54ce6f58b/sosofiduv.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/fezufu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/24713856509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=google+scholar+citations+university+rankingPDF 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_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 16708 bytes
SHA-256: c5e7d50238ffb9b56cd828e014d0273d61e1de3e4350278198a66085ae5f8e1e
font_01_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 10920 bytes
SHA-256: 1058bc266b6ec4faffbf83d19c984377ea50ca4a6d912442016a0745cbf2c880

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