Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b79393ac7610df…

MALICIOUS

PDF

69.9 KB Created: 2021-09-20 05:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12ab64f277f54e9ad0a7d7963ba4ecfd SHA-1: eb9bfaadaab4c46a15e11d2145cbacd5852af417 SHA-256: b3b79393ac7610dfdfd51538f37ac26b6576c57be5d2c46d6e8d8829265ba749
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=libros+de+secundaria+pdf PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35ec88b5a---lerij.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/natufevotumil.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/vagederidudux.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rikolujimaxowinexeger.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/78482987751.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/87281076197.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jarugi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/68b8a94b5a7535e3e60c87452bc4abb3/59220487571.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/zanesikifigofokixazijub.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614029187057c---wanixamuwitajikedovudeb.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gm2op3dravk6pplrcru2bmlnbi/78498000313.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e944cadb2---7828709351.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7a95fa89---57060196950.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51f036f3---vafewapadopiwavexoj.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/lizazumotobode.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/bibolopanexisuninejipalon.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/64760674529.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/36003739807.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/13118288140.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/61294798319.pdfIn PDF document text
    • http://mrybalko.ru/files/funomarerupajonelo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/75f55bb9bc8f0c4ce3966f107d6ae6a5/34044259233.pdfIn PDF document text
    • https://semut73.com/contents/files/bomawu.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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 15516 bytes
SHA-256: e752cc6b74bccce80740f0f58aa92ebfb6769aabe7432285eab4f2e38b5416b3
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10668 bytes
SHA-256: c593c81031c11e954adc0217baeb01dd69c5232bb23bea0172c4972d83d20fcc

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