Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e51bd7f97a72cf6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-13 21:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c92dab0a492ca74adc8d1419e73e7b9 SHA-1: 2aa6700e01b63359ce76d6697462972acd1f4804 SHA-256: 7e51bd7f97a72cf63d55f2a56bf2a66b62fbfe27e70aa119f7f06013eb2fe7f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The primary purpose appears to be directing users to malicious or compromised sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antifftech.com/uploadfile/file///2021090723370292.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/65832404875.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae6207460---turamot.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/272af9rigf0c2sq5heq11lkkm0/34843193750.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/nabapajusidu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tb3kgk3ivng6h8od7ongrvqqfk/nodalegulobunimuvipivopuw.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/kitubixosifudegenivuv.pdfIn PDF document text
    • http://vecsecity.info/editor_up/26436597907.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dikatixogavilov.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/89867015142.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/tuxejisokexobur.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zuzisiwamikumajowum.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/wozojigimak.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee952865d---70136608997.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gakiladokonetumawa.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/79546068631.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9db006d4---58899742749.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/bolabunanidijivufujosurir.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vumuvinuvok.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99085395820.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/tedopadapakanu.pdfIn PDF document text
    • http://tabletopad.com/images/file/berasupebawijaxoxagabajuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+handwriting+app+for+android+tabletPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 17356 bytes
SHA-256: c31c901504152c2f4ed2fc94e749def864aac08b53d2d4a68b630514d6eeba27
font_01_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 11056 bytes
SHA-256: 5284bcc540caedf3adf2692e5c34c8db50389d3bce7f223acdaf09b3a2e401e6

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