Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee5c80233c8cbba…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 22:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ffff7cf177f73558634347b0bca71b1 SHA-1: 1298f7a680971826945d6a32d30cafea9dfbf0f5 SHA-256: 4ee5c80233c8cbba7f0e6a3363106f559ed9078cd6cb930eca6d8e2c90603ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/150bfc4f50b4a7c2bd8f74eb4ec9934c/46999960678.pdf In PDF document text
    • http://surausa.com/uploads/files/witasudab.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ht4o2mklnotedljn5o024h9d6b/62144689058.pdfIn PDF document text
    • http://staropolski.net/Upload/file/rufaxevetomag.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1399546961---pivivokibujovafivorozer.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613518982874d---36545200788.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/putiz.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/panejipe.pdfIn PDF document text
    • https://tsegypt.com/file/49531978988.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3508ea3f8ce83eafddc0b3373d086310/fakiw.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5e5k5k4qnmkefn0uqeaq0lhjkm/19697093717.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70d771825---kupoze.pdfIn PDF document text
    • http://derma-dts.de/files/file/vavamaxiledenovinekirodi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abc8f1ef4df9c399c2507ca691815be4/65653731457.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4bf03ec5dfe2cea445bf696ac166489f/93886093460.pdfIn PDF document text
    • http://pvvc.cz/files/favotepivalit.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/boxov.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pavavogofugexebisajitani.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ok50bj96q0o0pmcf7m2uf7adrb/setuso.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/42964834068.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/586df59d6b7b9449bcd8b4c7ce270585/kojoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=organizational+behaviour+pearson+education+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_off0000c649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 11292 bytes
SHA-256: eecc2be1a339a16ce3501f841d10ad1978e1fc27e99d9647a95b678650e42644
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 18264 bytes
SHA-256: d32eb66ead9bb81ab42a9601557f3ed20c90ea704b8c963d79da409c33a528ee
font_02_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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