Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac5fc1b647f2fe…

MALICIOUS

PDF

81.9 KB Created: 2021-10-16 20:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7b59089d65611eb6810a14ef4bb0f40 SHA-1: d88c612111360e8eff69dea0ace99d6caf40496e SHA-256: 98ac5fc1b647f2fe95544f7c3c6d3e38273734d45112868242150412420f4871
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable domains. The presence of multiple PDF link farm heuristics suggests a deliberate effort to distribute links across various sites, possibly for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wodepcb.cn/uploadfiles/files/tiniximes.pdf In PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/76435261359.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/69268882228.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/mijuzepizugidi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dinujawaseku.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/49426993613.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/52a896e5b52770997662fe9eaa3adbef/75324041911.pdfIn PDF document text
    • https://steammining.com/userfiles/file/54690161948.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/97253385385.pdfIn PDF document text
    • http://bakoca.hu/files/file/gabosujoraluname.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615d7b3372a21---lomawiragifunaruximelikub.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/80614732691.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/zijavolirusigored.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/kotizoj.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/59279325764.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/lokigujojuwideguzof.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/damatogul.pdfIn PDF document text
    • http://traviet36.com/upload/files/60834292576.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/mulawumixuwiwitasuzedolik.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/nigavekade.pdfIn PDF document text
    • http://capableapp.com/uploads/files/85298174096.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130724126924.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/dajeduzasa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133beda6a607---jajuda.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/kazegulunojawesulaki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8204a935---futemovigeruzarazazal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=finger+joint+swelling+in+winterPDF 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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 18172 bytes
SHA-256: 5a59bd44b9737a0e78541e4942c0179e8edb86b806ed1f765cbaebb2bd543bdb
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 10316 bytes
SHA-256: 3a220b53bf14d19d947436407b5c522ca7fbd17e254272b17997f811d06237d7
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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