Malicious PDF — malware analysis report

Static analysis result for SHA-256 20937a874d5ad82c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 04:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73148838895beff2dec2b0eafab2ae1c SHA-1: 1a2460b23a7edd81c94168c3399a96d136c8a6b7 SHA-256: 20937a874d5ad82cf0f8c7f8d899b3c8afd5acefff729140cb9feadaefaa1a93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristics indicate a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=148mm+to+inches PDF link annotation
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sanuzopebefodakofe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b778qfakpoumtsuiaa8afua1t3/15269777566.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/38129631732.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/juzevimisibuze.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c742b2f5---72954676419.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/fifatanonolufimat.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rcfvho6jpek1ksfcafoubt70s1/6540797520.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa670618150---39299681238.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zovozesojoleguxi.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/babidawufalimadez.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/rukizivemopofo.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/riwutemavatupokuluwuf.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/2128803315.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/98988667410.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dumatasojasokuvir.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/20281854f69f079778b0f7a906233842/wotalonereluviwete.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6b50a8e8---7377395706.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/52e8362558dd300679e320995a8555b8/28930948999.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986ddc45b4---92325580951.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e0358cd2---57820415690.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4639626b30184cd95500f8dc082ac247/gonagus.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10428 bytes
SHA-256: 1ffa05c03c2d8b7ba5f9cfb06b58c5cbef03637237ba8be569ca410fa8a745c8
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16636 bytes
SHA-256: cf9e5b5d917cfda4ab4d5a3eea8868fc215df05dcbc4a8558a67d1249b3e8dc2

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