Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fe487900bebdf9…

MALICIOUS

PDF

92.0 KB Created: 2021-06-11 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d819fa68e4cffbf7304bc71fdb9894c0 SHA-1: f19934d1c3a58a59ee52bbdd68b3d9f09cf8e4fd SHA-256: 49fe487900bebdf92d27c51efef96b42faf0b9f386d62fab92a7a0b6c0ebb956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=th11+home+base+2020
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088b60f4546e---pemoxowoxebiwo.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h9knighcgk0fe61fcd2p5169vc/24813001932.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/583085ebe2edbab21bee3acf77a6a9d5/97801074987.pdf
    • https://batikatravels.com/userfiles/file/85553481952.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc9db0af9---saragujosebevisekodinap.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2897fb05d26be5170d253781e491b182/55728987636.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad72a83c219---gajirivupepubolenapeza.pdf
    • https://kisikana.hr/userfiles/file/vasalagelifidojixo.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1007d00ca9---36493216499.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/gs20uraejua8pq0lhran3ngb7c/41906141475.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607be737085cf---vexojaxilala.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9f376ef24c63a66d0b51a3dbc803ce47/fonosaferugalirozubegu.pdf
    • https://aradovan.com/userfiles/file/katimovo.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/99163567477.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3977b3f2---68399417040.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129aa.bin
32f1bd6af3c4a77c86f094965859feb4392c117d419dafd596bd04c371d9ccfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 5212 bytes
font_01_sfnt_off00013b3f.bin
09abfe7d6f7295a4bbe1a5251506d2d3495460572195ca5092c1e3b8834b3af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 12324 bytes

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