Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b663b0e316479e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-17 16:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfae200481850bfcc493c47a92d36754 SHA-1: 1cfb4e51786b26fde4a9a9c068eae585b19ff6cd SHA-256: 90b663b0e316479ea68dfafd1883d102e031befc4a0ca43bd6449bb93e3352dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing or connecting with a remote support tool. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lmcqu8f4fjb2ngfoh11quebkl9/85612625396.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaa03587db---deworudobiginujosin.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/46404355514.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/marazexorujage.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbae42a6---26965921406.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/97750392218.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/8644923174.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/40584450267.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/jiraruradaxo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/54ea1cea7bd156b1ebd8f25d4dc5e4a8/dovejajujudumenasej.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458b8d055f---22240476110.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb399a2183---4543521440.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/49313302116.pdfIn PDF document text
    • https://shidoremicrosys.com/media/30764228918.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210627162944.pdfIn PDF document text
    • http://cpils.com/userfiles/file/fepesunaxawemuvek.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tui2l5e4vjf8aajsq99ltldvle/7274810727.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2e694bcfc0bb3cd61a4df7a3570cb150/79545438007.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/3899491464.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/98453045968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=thinfinity+remote+desktopPDF 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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 10724 bytes
SHA-256: 68f77854eb68e6fbfed1ad1d61b76673a8ffd920b96581c11d6f04ff92af080f
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 17596 bytes
SHA-256: a845c1346ece88fc2d0717fd338dbedc597998e64dc8b2707b46c6d1f7e6b15c

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