Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01ffb8b6f3c5f65…

MALICIOUS

PDF

97.9 KB Created: 2021-08-09 14:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 847f0533d4cb8c958db6ed86ca90b683 SHA-1: 2e230f2d531263752a664731be5e32549ad17b4e SHA-256: b01ffb8b6f3c5f651e5d674d4f929776fc44905089ad7a7ae4d034e15a85880c
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains embedded JavaScript and presents a link farm pointing to compromised websites, likely to trick users into downloading a second-stage payload. The document's content, combined with the link farm, suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://antonioruizabogados.es/userfiles/file/50076602282.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b427f3108fb---39853187228.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1c115624a979dee5848f13cd168042f8/fogelatonesoligove.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/69763844968.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c7l5qp43cfqc93p444frm7e4j7/wuxojoguxaxetidukole.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/61969060010.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/netekuwonawipajamijijas.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab658009fce---590505863.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102baed90b04---foxogazobejazanaporero.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e71aafd2b9e---nojupelazosuz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5879ef0e07---30608723041.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd9d2523ba89ba8fd14ed6a5047cdeec/gaxojukexe.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rixifodarax.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/25170968450.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/72341299285.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/93454377418.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/luzuxa.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/25011232738.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2de6724409a55f9e999b19c2a62464a1/xuvonuzut.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/85658810375.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/tikapikafulolinopo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lilesatitovofakudezaji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcda881e127---63142834376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=declaration+of+conformity+template+wordPDF 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_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 10816 bytes
SHA-256: 63d94d877ffb6f33a1296bfe9a40fcd77c9e75073f5e04c509e82655f5c26b87
font_01_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 19296 bytes
SHA-256: 58480375ffee8d2aec341945d3dab850c75a55c450556ae3ded1424fb8e5c954

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