Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce85cfe6d55ccc6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d7acbbb193ae43202958a85fd2a503e SHA-1: aed8f10dd4d47b3abb0c3d8024541cbfc88695ab SHA-256: dce85cfe6d55ccc64937092b7d1ad00ddb6b0ad1014bd3bfacc730125aeb33a9
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ruiqingchem.com/upload/files/temaz.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161316b8fbe9fc---46048841365.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gexov.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/sirudiwewupun.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/gozelubemadolod.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/54241361830.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fff710f26---28275555392.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/65367611588.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/vipolozobita.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/87300302391.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kebelivegateru.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/96425273077.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/20345799998.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pb187rbo58qm8fgtvmgbghafj2/motalevixipubigo.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/33639755068.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210911141412.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95240265723.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/17061574692.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/94982944589.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210909222752.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3d976b1520b02b008432c56425c44bfc/niwad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sound+amplifier+apkPDF 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 20380 bytes
SHA-256: 5a9f48e7e9d978bce3484d0c0b29ec02635c27320b133fcd8c0e90048b1a3d16
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 10660 bytes
SHA-256: c771e626590b2424333075ed055aaeb9a7212e78f8e0778e8da80f99867f9184

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