Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d5b095a48f6b99…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 02:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f604842e81663f0cbd76ac2608973a2f SHA-1: 18b2f3c753669b48eff4df08e01336fd8d9d87e5 SHA-256: c2d5b095a48f6b998225da9701ca83b943999310bb4683a09bed0de1ea743ff8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'callback phishing phone lure' heuristic further indicates a social engineering attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=free+fire+download+apk+link PDF link annotation
    • https://obermeyer-modemarkt.de/upload/file/9950467567.pdfIn PDF document text
    • http://immopolignano.lu/images/gawosavolixibekewobotak.pdfIn PDF document text
    • http://01host.ru/userfiles/files/44367433879.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/jonuvepigonaveradu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ur25h4mclj52blm601k0n10m3i/pafexeriju.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jevosikulufegel.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6fe80e49---70502517619.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/45029167374.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/jusetinopowo.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210917201058.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/tosagax.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/66574407198.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/38348265986.pdfIn PDF document text
    • http://fourfoods.com/images/files/xanipodopesufenikaradaze.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7f4467a03---judumadakinivutiketib.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/mefuriru.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/peliniwijesemos.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/63250899314.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/xoworaremuni.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/57240874809.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0ffo0qf9npbjr0qkflr3d68uv/51100937810.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/zisajuroxapegopibela.pdfIn PDF document text
    • http://infosierra.es/images/editor/54279968388.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/7377166023.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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 10380 bytes
SHA-256: 00e7d140bffe1da55c4a714a54f910ed6def3b04dd791667919cf3b9a08493a8
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 14540 bytes
SHA-256: 163ecc3173f8b60f608c0a84cc2c3a63d5932ad79dc1131d66c858890dd5e195

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