Malicious PDF — malware analysis report

Static analysis result for SHA-256 e629b3aecfb007e9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 12:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 335d5b6b62d8f87c48effd5ce6ebd03b SHA-1: b7c1f5eaa17f8ba7f563633e3e6a4d0c90650f3d SHA-256: e629b3aecfb007e9ffdf6cf1fe2699a99a248d8bdb1192ec37c3c9aa3b35a96e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://2winit.com/Files/files/32015279226.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614037cfd1512---59691180378.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/26465497630.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/matomovodesetipavem.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/73838623356.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/64a958c053ff44b6d5d6055847013817/bikuz.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/sujipuzedolokabug.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/pitaronafewaruta.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/dakasab.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nisapupugul.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/nepanavukilusupurilum.pdfIn PDF document text
    • http://mamam.by/upload/File/file/vugulorelujet.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jijedoguzajafunarima.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d437be6d6c---11245026182.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/jegezudimuxilusis.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161442c7b59ba0---11855590864.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/bevaz.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/vupunikekolagoperewavuj.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/zixukidozezilupavumijifif.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/xogidibomoponizo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/688bbitit0kqujjc39v6flmikl/terutijonegokudizujonom.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/75452791273.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/73811593371.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/23158711552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shareit+new+version+apk+downloadPDF 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_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 10808 bytes
SHA-256: 4816cd3b784e11aa25aa62b462a3cbe3c2fad83142c197363a997670ebf80996
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 15472 bytes
SHA-256: 90eb01423911f21da0282c64b336b5afc78f96a787e4d2f77e9e8010d76072f1