Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb389567055969a9…

MALICIOUS

PDF

90.0 KB Created: 2021-07-31 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d5f54b6136c6bb4a5c757dcffe5d581 SHA-1: 81540f8ef6291cb06e87b14ec9dadf447d735bb3 SHA-256: cb389567055969a903104d8e14e57aaf247e761c65cf86d229b610433aad1fbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, which is a common method for delivering malware or stealing credentials. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted, but the presence of external links and the lure indicate a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=how+to+use+walgreens+deluxe+wrist+blood+pressure+monitor PDF link annotation
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/10241116975.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9d4ee9b9---powerimufapo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/15ee93c0bb1f6aec818e3bc472c2d44e/37808196426.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/fd204e8567def71a5692ff81f9cb320e/wurozigezun.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/62210276418.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/1396325281.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b890a654c---76185240076.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b8c22881d56---nobeja.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jeludovi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/14180842235.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/27c613e902aac73aa3dc16ce7518f9a4/vomabobi.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58108763978.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/27371182986.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/sepobesetavidupu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608240a74a108---89616967836.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/440e0ce5824f49c648b4502c0d8214f8/xujevalexu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66e8b416e---75850334113.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/memedevibig.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073329e60215---69664739579.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e622efc08---11865317898.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9kvv50tilbrh6730ccps3ja6rq/masaremeriforajaj.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ecf2b419cdfd462fca50abe61658ce61/71997073569.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d7b7cd05a---40248221228.pdfIn PDF document text
    • https://ferropula.hr/files/83087464978.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/44165165681.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0a05e7ead4bddd272400a334281a3a5c/13260010823.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 11156 bytes
SHA-256: 9e89b138bf2ceaba0a1138e1b46a765f8f719a406693131902d235f74276f607
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 19552 bytes
SHA-256: cfe76de61ee07574c336c321c8dec89a9fbc254f67830b955d9b0e1e9e12734a

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