Malicious PDF — malware analysis report

Static analysis result for SHA-256 806a5641b425278f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 01:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3039cf9ffec19bb21108492c6d27d54a SHA-1: fbb60afb675111299c7c98207e0bd8a75f849d2d SHA-256: 806a5641b425278f7a28f7b47cf14ed725eaf5a9cbafeaccd297a667538e6f19
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier assigned a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content. The presence of a 'LOLBin token sequence' in the document text suggests an attempt to disguise malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97abe17b8---47418513461.pdf In PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/4123152674.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ule90ra521u097oeaisgdeabmc/tatoxinebakumagesusonuj.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/9b6bc3aabfe693d5a3e7f6bb61121567/xupapevajetalepunes.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/712a743ed58a9f047e3474d845148bb8/21322140031.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/titivotevebozajiji.pdfIn PDF document text
    • http://acelybio.com/upload/files/22746335028.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/77217048011.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8c6a533f---38974100530.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/416eed196287ca4b3e027aef34c1ed89/61657498946.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/99278490003.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/40110929013.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/50770191698.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/wikugakolexosanuji.pdfIn macro / runtime command snippet
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3a4d1ad91---dijuvotimedibiti.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/3318898574.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/fuxazepivetif.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/pejibupixizan.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/55322724937.pdfIn PDF document text
    • http://otczenacts.com/media/files/68555500967.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3nakre3bqldupk99hiuug3sgv9/47015204835.pdfIn PDF document text
    • http://ambvetbrashersclIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=technique+chirurgicale+d%27appendicectomie+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_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 21220 bytes
SHA-256: 56820f634dddc2ea55b0ad41b8ef601a84b7261be43cbd340c2cd07a9d75a421
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 11140 bytes
SHA-256: a66b5819cb783ceb5ab89e54604d9fb0433355db522cb45b666d8a82b19d2dab

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