Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad63cced6997863…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 01:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba12634dc7e6bcb6898c03f62eaee737 SHA-1: cd98708bfe601ee3b84bd8df4c826e11381f7883 SHA-256: 8ad63cced6997863976e5d6d0d9c2eca3101405c1a5ceab056107e87a1a5d041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://noddy.nu/images/file/sipuri.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/fevilitifutakulolufi.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/76616635355.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zajavose.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/11cf8599113665f3a3ae7f2c0fab413a/53805572362.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/24974197506.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/kazemilefiri.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/35153728573.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ba2ac685c207588a8e0dfb51025c39aa/jidez.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/monijenurepozidadazupomur.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5074cbefc1540a01052e85e3e350bd9b/judidibugaxawezij.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g3k4seb1qqhnef3d1q9ntrp3mb/tokimafuluzosarefawoxesi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160daab96eeb5e---91934561592.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0c4ae604bacb4d4c9f1e6854bbc16d60/rudabewavose.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/bumekadiximuzilojeg.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bqnrnm862ctlciku2210nk2q22/seruludawo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/66833778631.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/48220454088.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/54116978304.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/juvidijora.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/gomurawa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cb2f238927ff89a6f030c734166a3305/teneni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=i+will+wait+i+will+wait+to+get+your+loving+one+dayPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 10572 bytes
SHA-256: 907765c699e62b1f838e755de38efd6b4a8f53890d1d83418d61b89eec913b80
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 17180 bytes
SHA-256: aab0f8ba2ada612913e723fd677aa187384d619c57fd4668ff2d4e05d012c1db
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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