Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcb5f92ab8864c7…

MALICIOUS

PDF

52.5 KB Created: 2021-09-22 10:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bda7302e907a670ce6bcff1409b4ec8b SHA-1: 7924ccc2596c222221ccdc9b149c1c542633f06a SHA-256: 3dcb5f92ab8864c7c77cb0da619e2ffdd70881f47a04237ac0f84ae7b66605f7
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 within documents. Additionally, the document features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8448

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/37dea8eb0619ebf3da8e847e2a2bd331/19448692052.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dejetofojelegolaw.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/44518238865.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/38461575709.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83419554273.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/jubudononavesojutumi.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rogeb.pdfIn PDF document text
    • https://thietbigas.net/media/files/91964487654.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8a6b0cb8a05109e7845b7f8bc06b546b/47259102730.pdfIn PDF document text
    • https://baglab.pl/galeria/file/riligenoxofogefi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/33554122204.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/tuvavowaserifirasokoda.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46549189516.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///tasufikunasawuridipesegej.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/51674356794.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/loxemido.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/76779081628.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/67457104816.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38068608980.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurotanorazazutu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/3928307190.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/gugosuzofef.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624027064.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6e3941ba04579e330513584ecd242748/93779521020.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/53644320959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=translating+trig+functionsPDF link annotation
    • 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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 10440 bytes
SHA-256: 39f821f51001bf0fab8328e2894115903423a82475d7cab39907e73c234b32e7

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