Malicious PDF — malware analysis report

Static analysis result for SHA-256 794ce932ae2c00f0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 19:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1267a272abdc917f1da80c01ba32734 SHA-1: 29ff6806c5f0cbfaa57e345eac14173ee27ac79b SHA-256: 794ce932ae2c00f044ea5ce6ccb57afd97af5e097988ed0d3156627b61d568d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kuresi-kaitori.com/upload/content_pic/files/41293418176.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c755006afb01015ba6885611e0ac1e5/45104971857.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/38584376498.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gewil.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607747727fba1---galejupobiwaz.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6a847a2b---zusijis.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/filakumokere.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bizipujus.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5vf1l2fu8vrq8bin9b1bpk0u5v/vedinezelamanigapefav.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/19827599911.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kiof9ktb3b0jts5c1jjgdnkrp1/99626985303.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f28439bef---94712251479.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/6413478109.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/85183029778.pdfIn PDF document text
    • https://razredna-nastava.net/files/32146767178.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/58908140156.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/58171769938.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/nakupukobek.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12605486888.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f996ed800---sekezifekak.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611a19f7a31cb---wepimibuzedewufupivok.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111e09bd2---70434296693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=underground+house+plans+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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 15000 bytes
SHA-256: 8711f29d26625c0fe83ee4941692b41275f87610f5cb4f710e6421f37681017b
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10696 bytes
SHA-256: 54d7339bc6d3ffaa653e98d1841261be140a11e93fa1d5ecf75dac9040401516
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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