Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be4a818047201a8…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 17:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ebb9d1d6c9e9f94161e1c12b373eff6 SHA-1: bac2d1d931cae2ad39baf79b32182b53072ea209 SHA-256: 2be4a818047201a807f3e850aca26ecb80ced40c387cd2011047250dd8555278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://coolscape.info/images/files/bibojikemikir.pdf In PDF document text
    • http://adimhukuk.com/resimler/files/48202040973.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74450194732.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b2d7e81---88203993213.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/tametezalo.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/54895982824.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/karulezezas.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/51765006507.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wazukagumik.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/55846558792.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/danaminuk.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/44291774698.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d752735e13---26177481462.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/rorodumimexirosu.pdfIn PDF document text
    • https://biomisszio.hu/tmp/sakinikexemonuroli.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tiruwota.pdfIn PDF document text
    • http://szabobuszberles.hu/files/files/gesepugutetefiwu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c108bd154beff076d4629126058a40b4/73999943905.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65faf3fe7---duvuxomodesijepigomok.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m1so6rhrqjtr4sn7hre1jfg45u/67411811646.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/41713188685.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/57125216609.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jaguwekiwixoliburatof.pdfIn PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/70448015842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=novels+by+umera+ahmed+pdf+free+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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 20676 bytes
SHA-256: 23ec4721d3860075b828888364f1bf075cd505afb34741dcb4bf897de3f72967
font_01_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11056 bytes
SHA-256: 5d9b0438a026e6a61d8b82b61e41a5494a5f5c287c7e6d7f6d8f7ff32cef5214
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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