Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f69fe9332698357…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 13:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 234a576114337f41c4f0cd103c2382fd SHA-1: 10b51eca7fd8bcee9ed68b475b6306d8c620098e SHA-256: 4f69fe9332698357657c60a846e5063ca7cafdd8f8f5845f2d02af6186d45a0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://velo.hu/UserFiles/file/kobufelilenulusak.pdf In PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/10465995011.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/95883162390.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nesararejuforafatoboxe.pdfIn PDF document text
    • http://splogservice.ru/content/files/7189527426.pdfIn PDF document text
    • http://splogservice.ru/content/files/87302999735.pdfIn PDF document text
    • https://www.confirmedtour.com/files/geleregavawuri.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/14105233667.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/31746686027.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/92464639187.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbc826b3e---90818813474.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/huhhj7eckmnr6k7iuaps5f3d46/97727091732.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/95946840812.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2cafc3ad68ad3228b1059359e612102/6719621691.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/bekafu.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/68237549018.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/20330759727.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/91282087815.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/sorapeniwegufi.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/22254357974.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16154548b1609f---63195258303.pdfIn PDF document text
    • http://kahasat.cz/data/file/76203991663.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/84861935029.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/19431805991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=git+merge+branch+to+another+branchPDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 10640 bytes
SHA-256: 1269ca6fbc9677c542b3f4412cb8562981585308d91a4daf60afd206fc926d6a
font_01_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 15756 bytes
SHA-256: 75f707ba809209da1fbe6feced49872ae95f1b64ff84a2891e9034d058f6fb7d
font_02_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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