Malicious PDF — malware analysis report

Static analysis result for SHA-256 95839097b39560f7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7de692b6f61641d201acd39ba309f487 SHA-1: abb02c5bdb899ee38bd632be120b428ae87e0f40 SHA-256: 95839097b39560f77c9698ea7f1e67ccd5ba7c9f61a39fabc7c6de125e397615
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homestayhoian.vn/uploads/image/files/kuzexitojelegowukevuwufi.pdf In PDF document text
    • http://registermycompany.in/admin/userfiles/file/7179691194.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/konafekuxejefatirinugat.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/lozibuxomupetakarulotaka.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/91853318695.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/laponuloroli.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/66261298699.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/jineborarin.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/47907485791.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/43053899451.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://rajaketiga.com/contents/files/53272707526.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dcc80892---pepinasal.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/kavilararuban.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/29363639935.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/3164955778.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/budurowiloje.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/51810570503.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/2943500676132fa1bd156d.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9d045ba2---nurekopofaxijew.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/givegolomimekologe.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b4eb7e89777c9534d085bf85c50277b3/lafesifo.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/93066225536.pdfIn PDF document text
    • https://tarsiman.ee/files/file/99322403998.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/92069035119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+zoom+app+from+play+storePDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 17432 bytes
SHA-256: e1b464c1b65fd3edc78bc822d6d8b34560fe0c27aebc3048027c1a99635c10b9
font_01_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 10828 bytes
SHA-256: 2448d2eee27259d41c3990e0c2227f729bbcdf9dbfa1374fb5676dcac9b6577d
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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