Malicious PDF — malware analysis report

Static analysis result for SHA-256 43272caefb6b08d8…

MALICIOUS

PDF

97.3 KB Created: 2021-06-30 05:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b4c9ca2390e52c2a2bd8a2dcee452cd SHA-1: 2111db8d0bcaa4ad101482881137b6d4b8cf8671 SHA-256: 43272caefb6b08d8b103855f8550e52565b93fd74c4b5fa96e5d33fb46181760
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 sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=find+all+possible+values+of+x+calculator PDF link annotation
    • https://kede.org/userfiles/file/gasufogikowin.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8591440d6---memesawixumax.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a32e80fd02247d855ad626a726b5a680/25803990682.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/58612394017.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd7bdad1b---tisewopunevekanoxer.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842a01effed---gojemasijopiposo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02808568f---lumizewazinoduj.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3au4cavhct328341n8acolfnm7/42301807828.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/9291921473.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb613b893---nudufojuwunigexapuxogogam.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/makutokugix.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/12704446932.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181907.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58b505e8f---12186741468.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a235c51c4---soviboxefox.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/861c42e4d405578cd65f229b3d3147d0/torulilutusesasugopiduzop.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/vopasukejo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087697a780b6---33677183172.pdfIn PDF document text
    • http://renovator.cz/files/file/fidebed.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/voliposuwidilodalom.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79b4fec4dd---minesidufusutubalozujapa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c550dbd54b---ribipowuveniw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215151214246254.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_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 11000 bytes
SHA-256: 7ae005bf90f74112f4b13346d7fcb2be29718216c03a7fb10d47c2039474a85d
font_02_sfnt_off00014952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14952 18048 bytes
SHA-256: c778ed1f5e08320b670e6da670a0e32b410e787869650536107ddd107bc331f4

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