Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea1a792fadcc487…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 19:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adf20777caad5413a055f4ab50565666 SHA-1: 632e815352993416dee49341955564d713b815b3 SHA-256: cea1a792fadcc4873748c0881c97cd44a8c268d9aabf6ec83ae1310e3fcd1e4a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or further malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=metodolog%C3%ADa+de+la+investigaci%C3%B3n+cuantitativa+y+cualitativa+gu%C3%ADa+did%C3%A1ctica+pdf PDF link annotation
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/72061561367.pdfIn PDF document text
    • https://qkon.ca/images/file/10075691116.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///85685439779.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/jezesinim.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210817_7EA9E231C553DB49.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/30912460849.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/nenilal.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/33619447405.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/80959016812.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16118d9f8969a7---43977037673.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aacc65ee2---3225730614.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/50799726277.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/vukigofobubafopevul.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/40683840814.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5690fdbb7f---munokezapi.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/48108801797.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82982ea2841ac52b9eb149432b59f0d6/dobiwolamoxewesivimorukek.pdfIn PDF document text
    • https://palet-school.com/files/files/xenujivosakugew.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/21302804032.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210720_75db3.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c87bf46aa474681e5cc8723276fc3e8/zexovonexuj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd81df79209---15287562047.pdfIn PDF document text
    • 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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 11348 bytes
SHA-256: 4402c1846e106367d3e8123b23d8dbc7009163306b6441f25b02e1dc8d4abe05
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 17592 bytes
SHA-256: 107a492d8d4bf2fabacf34156552e98c495e73744efce113c19cd42e9b545305
font_02_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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