Malicious PDF — malware analysis report

Static analysis result for SHA-256 503fa6dd1655b64b…

MALICIOUS

PDF

116.1 KB Created: 2021-09-04 21:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b8401f88f9cdc81aaa5b3fe065eece2 SHA-1: 2dae0b2572e9944aaa5838ef13424bb32057412e SHA-256: 503fa6dd1655b64b310c1072a25333886dce21fd530e0ba08b7ef1ae0ac943b5
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through a malicious attachment to a series of redirects, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.conectadoscomdeus.tv/arquivos/file/47523573048.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/91875f270987c9a3a27c859b6a393213/88965273543.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rageje.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b4cf3d1826a1c9809c3a3d684398110d/towugikefopurazug.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fuwufimusaf.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/83244982520.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/21223925509.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/livuduviz.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16342663077.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/66572749283.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/relavapekalixofuwokagop.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/51e372b0ab63573f60827233eb8d1a43/88152834625.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb68f060dc89db43222fd7dde1e48064/8748808021.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/eh49b3l1mehl1bvrprsjclagvu/sejejotuwavidosinesozuz.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/26737317408.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/namovejuteviravuzi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/vokazewolegimobixadefexab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7pqd3kksng8ai0oul6j9ji254/livitol.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xolikitamo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/20539403715.pdfIn PDF document text
    • http://slsnn.ru/content/files/69900723624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=les+conjugaisons+des+verbes+fran%C3%A7ais+pdfPDF 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_off00015285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15285 23928 bytes
SHA-256: 98fefd2ed4aec39cb247548fa13d22956e470976a4158e405378e4d11428c527
font_01_sfnt_off00018ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6ED 11244 bytes
SHA-256: 7906c1a81031908ad9ed142bf049e49a57a6ab695b95839e62ba26eeabd67fc6

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