Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b18cc33f8d9904…

MALICIOUS

PDF

103.0 KB Created: 2021-09-04 07:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca87e6c1d5ea43008d80d0f8fcc4d8cf SHA-1: 91a69e17ef831118df2f3cb2a12c2a3460521e30 SHA-256: 55b18cc33f8d9904d10a6396f4d8016d6ad9d29a146a368f644dae3bffd47c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of external URIs and a link farm heuristic strongly suggests this PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://jncs.kr/page_data/file/20210627040638.pdf In PDF document text
    • http://apex-architect.ru/images/file/rajipezenikovedisa.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/31169cd87c815b116e993198621b220d/76560905052.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/49291504541.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/zenoxatibomonizilul.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/gitamekajitufedulut.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wotewiritasufigewokuje.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/bizexoxabomasakupiz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077988e5bebd---56447207290.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/47c4f2936aecff127aedbec4d08c5e4a/79785130270.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/oqte224cmcrut55vgkkfl9cpv3/74086384010.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/giwotige.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/suresibefijogekirur.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/fb73ba74ca82c19f2ba2851524d7f27b/tofamefun.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e114e88b---64273384614.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/99670889206.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b956677a6---samenabu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611caec455b14---26364408381.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da91b64ac---39459615889.pdfIn PDF document text
    • http://stroi-sistema.ru/img/35283834512.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba2feef06---jijib.pdfIn PDF document text
    • http://htygroup.com/upload/files/39116774417.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xedolezidigagatawobosok.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826c6c28897---54199290423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=corel+draw+x7+tools+and+functions+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_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 19464 bytes
SHA-256: ee25d6e1fb9932de9b33ea66791624aa0882c570be13d500b504014cc8ae0079
font_01_sfnt_off00015c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C08 10984 bytes
SHA-256: 41c55bca596df88031ef59667627cd3f866f6c5671ef4695b6e2f26ce0e4fbff
font_02_sfnt_off000175d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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