Malicious PDF — malware analysis report

Static analysis result for SHA-256 776355c2496f0db9…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 11:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29fd21b33000245947dc029b42259ba3 SHA-1: 90202aea349f3d69bb2e50dcf57115c6e2248a21 SHA-256: 776355c2496f0db9c3bc8cb2012fc0120075d95e457df9be66629688210133f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggests it is likely used to deliver phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=blood+sugar+level+age+40 PDF link annotation
    • https://eldorado777.ro/upload/editor/file/kipepadilige.pdfIn PDF document text
    • https://webhosting4.net/media/file/69013205974.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/2690436657.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/9081214998.pdfIn PDF document text
    • http://idroter.org/userfiles/files/89890752036.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608054d6b5a64---36029710670.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/kopoboba.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/35465592588.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/galafewug.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d45ca4a2---fiwavolaseliju.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b63cfed9---maxezonupi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2299b0a2---dojeneveju.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/pejux.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/35586744871.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o48bb2g1qji2ghmpvs4ara39q0/petogowosagegofatubasuneb.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/gatubunate.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/95553383869.pdfIn PDF document text
    • http://chinazzjx.com/d/files/sipiwarafimaba.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8f043619---30435139989.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d40ff02a6c4c1e6f4fa89a4b589525da/44789857233.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/54061681255.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/37645276391.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f185f4c1---77787573215.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e62c19c6---27107177589.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_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 16964 bytes
SHA-256: ac51d736c22d2bb80302778c7f200cdeea2e61f0844d8581fa8fbabb46afe8f7
font_01_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15083 10548 bytes
SHA-256: 837ff37aac18d8522780bdec76af43b87f8eddcc1974abb524fc880bb1698920

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