Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66b703cb2a2f487…

MALICIOUS

PDF

93.3 KB Created: 2021-09-02 10:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 669037c5808c448a77e1aef7155d82c7 SHA-1: d40438838d29fb4e8c530c39417abaf581800b21 SHA-256: e66b703cb2a2f487663fcbca2951bd19eddd2e2c0139e48af2e0a88931ba0447
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=mysql+dba+interview+questions+and+answers PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60ad6f287---botog.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41999321917.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/folodujexedewa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee0348cc79---jakewoxulonojilujif.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pituzokifa.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/fusukurirel.pdfIn PDF document text
    • http://tcihk.com/userfiles/85897501960.pdfIn PDF document text
    • http://rubensova16.cz/files/file/97373823081.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cdb3bf3ea7a58ea0acdba2e47aef1755/22495279484.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/zilut.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i3q13rgh2q5m1m0d5s1oeh94e1/93393922195.pdfIn PDF document text
    • http://ndt-ultratech.com/files/89429262955.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cd0527da---porojupokeguzedas.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e0e2c486---37926893085.pdfIn PDF document text
    • https://argumentua.com/i/file/zenejasifozo.pdfIn PDF document text
    • http://billsky.ee/files/file/79603858176.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/95306216777.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/3080299112.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce5474487---jamawarukejer.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/81e23fca0c41ddea4bcf4ca793b90ca6/duleliwubijegonav.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/32642699840.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087df85d4f7d---fuzavuruwidanetopoveluma.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fanikosiwewupu.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/raroxewi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608735438efe9---76540906908.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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 10884 bytes
SHA-256: 5a3bd91f3830971bae8ff3cc70c7790f3fab649e9e61d0ddcb6cb4a736a54c00
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 18604 bytes
SHA-256: 1aff7dfe2a808000edf53443d12fccf2383294dea79b47c1adb1682e7fdc25bd

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