Malicious PDF — malware analysis report

Static analysis result for SHA-256 66def3b04029f545…

MALICIOUS

PDF

98.6 KB Created: 2021-08-11 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f81f4ed154eec0e38c8ee8dab2db4ea SHA-1: 14d23031cca9c25d35e969eb1e563d14fba72616 SHA-256: 66def3b04029f54527de29c4c92b55bc53440150f7d9106b8be9293792fe5844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate that the document is part of a link farm pointing to compromised or disposable hosting, likely for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accuratesearch.com/userfiles/file/digumerutox.pdf In PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/94015013000.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/89971095408.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/torisatezajadotu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e737e12d---22323503743.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/72618256cf18173f1d04e445bf4597b8/61321316465.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3b49d97e0e03c31a549838f6ff539741/11922147288.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/32795525365.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/151b68vtlvq2lvg7a6qj768o8b/55082452835.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/23472713287.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/87835350110.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4pt8lm0m0tggs0o0u7jj56un44/dorijutemagavavazazogutik.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/sokoniwusawakeve.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6b95d847---jagiwofuten.pdfIn PDF document text
    • http://epplast.com/files/file/64630103188.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n4dpqsoiiqr7jqrb8d54s9pdl8/xokexegige.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zonivivovaxabiwetakatuwir.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/47082162787.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/19e818f3c0f6f8a77628de1fbf5b57fb/gexezefud.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/65621577742.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ji6qnjecm7cic3hs7rcpbsmeju/20212598786.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766fa465e6---95641948470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=which+is+the+best+business+to+start+in+bangalorePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 17552 bytes
SHA-256: 17af12aec76fc74324e190097f0aa6006cdab1cbe4a1c52f619c06d4afdbd763
font_01_sfnt_off0001493c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 10740 bytes
SHA-256: 269fe503c6657c1ab5a45cc3769c46a0adf758b659d40df889a607db7bb5953c

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