Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7c3af036a5ef61…

MALICIOUS

PDF

88.4 KB Created: 2021-10-13 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8a98ad7f1c7d99c71edc0e4387dc6cb SHA-1: ea9aee33560026d16dcee388b40f09894c7f15e0 SHA-256: 4b7c3af036a5ef61e62e6935f930cc1a864c61b9115438a70294d50b7e0dfa67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, with several heuristics indicating link farms pointing to compromised WordPress upload storage and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or redirection to a malicious site. The embedded JavaScript is likely used to facilitate these malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.akilciilacdernegi.com/ckfinder/userfiles/files/julekazowat.pdf In PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109111501138413.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/puxunetaxomok.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/93831773724.pdfIn PDF document text
    • http://showpelec.com/data/file/20210917_233253_459.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9656f171---6491584318.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/minebitavetotelisuta.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pegifipodejuvopiru.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/22434216228.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/62992696037.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/zawitavawilatipafole.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/72541716812.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca9f29365a---67586513178.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/zuburigusuviw.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/43702606311.pdfIn PDF document text
    • https://alkoplast.rs/files/41253403965.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e0f1c9f8---45433841253.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d2501fa85---70192469784.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/malamowovubivir.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/20439313207.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/94002371292.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/36684887691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=what+should+i+do+if+i+miscarry+at+homePDF 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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 19928 bytes
SHA-256: f0e787accdcc1b54ff6b8117d6a6128c38311f7960e01b218b80639b3720528b
font_01_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10844 bytes
SHA-256: 96fbcabeee5a7ad1687d667c6e77f7c520925ee0a4e181f89d0e90add72c803f
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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