Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ad514c97a35a3d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 12:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1405ba1a4f0b1ddc55d3807f3685c27a SHA-1: d574c551c81b30c51c990c7206da063bd23102a7 SHA-256: 16ad514c97a35a3d2d56e50ad2de99916fe66b1ae0c4e8d49351ccf452f7ccef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nacionalequipamentos.com/ckeditor/uploads/files/59954204621.pdf In PDF document text
    • http://ip-malkov.ru/uploads/files/51643966725.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/46460092968.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/79891328427.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/80128216855.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904173537.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bojisiwivaneleme.pdfIn PDF document text
    • https://robertbah.si/files/file/digufunerutevoseko.pdfIn PDF document text
    • http://ch-yang.com/upload/files/40981017330.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/66945786509.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613714d1602df---18904222948.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/58022979340.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5b91dd5f---43207692877.pdfIn PDF document text
    • http://rjt1.org/upload/files/86925610646.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/2130443852.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8a9ff29e59a733b935c1d9f6f9794c6f/43258353989.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e554b02e9d1f709c9540bd772b162b42/97770888235.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/8578850059.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/68268989439.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/29340707070.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/57760514847.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/dower.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/fegetiwomixovemosifidire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=el+albergue+de+las+mujeres+tristes+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_off0000c50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 10972 bytes
SHA-256: 1477f78fb91ebdfda41067ba4c51d95f993b1e129124374993d106c754304ee2
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 18476 bytes
SHA-256: df920f37ed994468b76e9fc6a4cbc8939b0aecb7f7ec2becf6810f32cb177796
font_02_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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