Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e0e0476c39a400…

MALICIOUS

PDF

99.2 KB Created: 2021-08-10 06:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 85fe79c7acf8ff897697cd5981c80a39 SHA-1: 6a9db1fa9c4be4144eb68e0d5767c96d8a72347d SHA-256: 92e0e0476c39a40074c1564bfb23a22f5f3b5f754d8390bd30ad1bb00e4d8755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://krisoc.ru/uplcv?utm_term=bdo+how+to+farm+black+stone+powder PDF link annotation
    • http://gmei.lt/ckfinder/userfiles/files/52164300763.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/86206022009.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/11cvq68tr834s2qqjsjbevh3l2/39838113250.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c4d206d19bb1f001499f3818bd04ede7/44894357082.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11092750655.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d7990609214f88ab6ef969e948a5c7a6/fobub.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jopoperepu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/figmm4eh9m8no6go8tulefe5e0/vozelabuwipowezoxa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a87361e5a---famexalulepej.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xatepufifamegowidide.pdfIn PDF document text
    • http://inse.us/uploads/images//files/pumedalogokizutotadevozeb.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/16114405901.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ad0a01c3ce6ff368b5643d47cfef1942/kononisifikom.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/31508928899.pdfIn PDF document text
    • http://186086.com/upload/files/tidosarajefipodu.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210709112626_760435128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa73adc7ff---29315259181.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/090350a3119d3d3ca07fc63e01215c71/tezoliwodilulakiganumub.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/rojuvugakimatasisuvo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9d53bde5cba6be689a7da78d8a9a0f95/wemoj.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/me6nmpe4taolvqvdkmbior0uji/26696224034.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/naregulakibaligivarebab.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dekuregozuxudekekodari.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 18128 bytes
SHA-256: 1e304ec347cf2757fb12317054ae8659d1555a806220b6b1a77e400ade05fb4a
font_02_sfnt_off00014f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F34 11164 bytes
SHA-256: e6d84debe60311624414e2500ddff8886d6b6bc4242c7fda665d9cfe2427b8be
font_03_sfnt_off00016906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16906 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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