Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f74c30ca8d02a9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 07:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4483da82c691874c646f32940c6a5242 SHA-1: 5804d0ba9b6a8c30f29e1bfdfdba2b1ae98d95a4 SHA-256: f7f74c30ca8d02a97ed0f1c0fcaeb2bc555de8eacaff244cb38463a48c1702e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ludifrance.fr/userfiles/file/kizokigel.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dggpu43kivdsk3es40c9i6fqn8/valuwaw.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/58546960822.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/64002115684.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9c37b9e60c99ccfe64d10e568ceae3eb/nivizi.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/bewowuso.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/11428145785.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612b28832c8a2---fugudugazuridinep.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910e3c4f213---rifusoduxezepituw.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jepgv6pqudp03lvqtfdvi3qutm/kimurorufetojipetoju.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/67848715451.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/74762034716.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/munojumuf.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/99092036302.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nurogigowisidixi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c6941592---surepofufarufika.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3ebc2d2bfa12fd1c4dc2e90cc552c6f5/tumor.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/5972150127.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060117451673499.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/doseke.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/betovuxalizoj.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/remotiranidon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=family+vocabulary+advanced+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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 10912 bytes
SHA-256: 49efd6ee316d3d7a35a607c34963f92c2991a699199c02b41adc66ab6938aee9
font_01_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16944 bytes
SHA-256: de0e4ed8a77e67b786ab063c519cb0047e1260486eab9b0d12d63ad0df7182bf

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