Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade2a606253f7b3e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 17:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c273c7b4e7a2794b925b9c4736432b81 SHA-1: 696e77a6dfdc82e2d09d38c1f68f4211188dddde SHA-256: ade2a606253f7b3ee934d24e50fec018e7b2d82464b2f5664e3ad56523125797
156 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 and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synodradomski.pl/userfiles/file/tifefofuvok.pdf In PDF document text
    • http://svx.su/ffile/file/kuwarov.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6875bee73---zamijeriwegugoboji.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/vimalisajatazikinabel.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/renebugetagizodemix.pdfIn PDF document text
    • http://qzgj.cn/upload/file/begoroletefu.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/tixufoxoti.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/9914834851.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/beretolerupuberanixot.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/dozijomeduwufomaguravosi.pdfIn PDF document text
    • http://glttek.com/userfiles/file/10182227013.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160739fef7ad02---komuxeni.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/degigenaguwun.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2724d2fb0---mujenazedo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/29814333511.pdfIn PDF document text
    • http://jarosi.hu/files/file/7271471498.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/zikegatoga.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/2088967431.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/9749773695.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nelitifa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/ramuligakovelaxatunod.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/tc0h82gc84fbudu04uoivl9g6t/sojilenupuwox.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111544c2755c---xuzudukarakapikubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=systemic+anatomy+textbook+pdfPDF 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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 11156 bytes
SHA-256: d3bf892042087fbe7a041dc62ae69be7e5f469475417d9980f4c21486a15855f
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 17424 bytes
SHA-256: 97bd8c2ee3e4a013a3e38214f9ae226cced4640a2c872472d4a977be235c23a9