Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a816a386f46fcb…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 17:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7c385a28146ca74b4d8af4c90aaa0bc SHA-1: 8b4f648adbcb1f8f9c2f23ad42b3fec7d509713a SHA-256: 24a816a386f46fcb4e5212e3387b9d95e99fa0dfc7f0be62680fda66b436437b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, suggesting it functions as a link farm. Some of these links point to compromised WordPress upload storage, a common technique for hosting malicious content. The presence of these links and the overall structure suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lnshiyue.com/userfiles/file/20210904080044_1436434961.pdf In PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/21784561825.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/80598206023.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kokajibowivasafek.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f8mbhi1po9rhhr07j5ajktn4h0/vopodidogowon.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/benurorekafamekuk.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/zojokuwurukapomefonuxuf.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanexe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rb7hvmv9jmpnitdasm51btfr12/44300796581.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/46c65f901aff14fd71f4ef5b4f035d14/51745568287.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fae7434b010d2b4c42701eb740a2978/56493983781.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/42578523529.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/23943792158.pdfIn PDF document text
    • http://inistor.com/ufiles/files/95528633049.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850e229380---68414402253.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/jewefudep.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/kebised.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zarozodogaxoferawur.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kowozav.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wixelolepaxil.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/93389389303.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/93972057043.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614846312d255---julejunizekozuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+live+wallpaper+in+iphonePDF 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_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 10584 bytes
SHA-256: dbdf3642dcfe54b110553f346d10488e4edbc57d6fc8d02f45aaa576d5c4ee67
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16700 bytes
SHA-256: 194bebbbd1e4d45340f1a20adede15a41928c2741083ed7e9603f803a73d992a