Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd02da3a0fa0dc7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 15:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b87a000231c1e4b2c8a2e97b7e5d1896 SHA-1: 8dff543925f390f1a676329746610a0302250671 SHA-256: fdd02da3a0fa0dc7e2b46d3376f0328e1d1417f17299822581b751ab84d48db6
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. It also features a link farm pointing to multiple disposable domains and compromised WordPress sites, likely intended to redirect users to phishing or malware download pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8085

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://ketchas.ru/uplcv?utm_term=4+www+friv+com PDF link annotation
    • http://controldellaves.com/app/webroot/arxius/file/31557244444.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/nifotujir.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/29077180613.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/94570928274.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/bizomolujixewuwekagas.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/17933728131.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/77k02p660o4ekjaoec825ssrun/giporemafobopazemeparuji.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/4894454863.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dinepivowerimawozikot.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/15266342544.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/saxalebi.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/mizumeminufimipopurokibal.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6b1e0185---xabenuxojemapurepobo.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/dusekitemovuvegiwikuxafu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138101a0c440---welatikagakuxanatisex.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/gabosorixukukikizad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/53c57b00f58a698f5d938ed26a87eead/80779138.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5afae699fbd550f4a9b6876b770ca07/56818674390.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7be8bc20502f86b8e2f891fa3685c97c/xaxubofipolesos.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 17460 bytes
SHA-256: c104af13d465b690fd1f3220891fc42f7f3b6ef4d7a1910d96745dbb7dd2f3f3

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