Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a6505bcc3715b5…

MALICIOUS

PDF

88.2 KB Created: 2021-08-04 04:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ad603b43ec54ed501f07ab880e7dbce SHA-1: 22ab3b8074728faa10fc16c16d81654a069418fc SHA-256: f6a6505bcc3715b5c02551d7faa47b4b932a51846fd22477b83257ea7ca6ba6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for phishing content or further malware. No scripts were extracted from this sample, but the presence of external URIs and the link farm structure strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/533f808e1bbb2409f8c5c171b1bcff67/fakuk.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264bd1bcc---guwevofumedowirinefu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/noweriwezisev.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/72490138685.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/bojoxuzegodin.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54076363017.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b442517e32c---mejevologuxupulel.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/22172133792.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/velekarakigotumebeka.pdfIn PDF document text
    • http://tootooair.com/FileData/ckfinder/files/20210630_4775164956E444AF.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/207594131.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4f3f27fa2---zagaloguv.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gabulemitinupoxila.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441bbe6e4---27454477018.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210530060327603.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32497521072.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d27a296fe339c495ba0dd156c27c341/11133226936.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/vogakezebuzogapogetosab.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b070a02e13---20897431077.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3c9338f7---85536609797.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/93728236865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+environmental+planning+and+assessment+actPDF 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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17324 bytes
SHA-256: 4fa16369fb84fc254eddcbf12bf547a9d4ae3e6f4b78fb273b1555c80a1966dc
font_01_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 11020 bytes
SHA-256: 33454a82b2731dd7039248e72fdcbf090e2f33b440f54e8d4d5e78314a369077

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