Malicious PDF — malware analysis report

Static analysis result for SHA-256 471275ee85784869…

MALICIOUS

PDF

134.3 KB Created: 2021-08-22 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fb1ab765e93dc2fb894ae329a7be058 SHA-1: b25ae56b75453f7f293bb97790e8dc123ace8654 SHA-256: 471275ee85784869b150b5bb2ac7b49951193b8ddf4be8953cb887fc1c21abd3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution chain. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript and numerous external links point towards a malicious intent to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/khur3th6kmvaufk9v5dn01436g/66203610289.pdf In PDF document text
    • http://elturo.ru/img/upload/files/27489840464.pdfIn PDF document text
    • https://cooperspick.com/files/11335424921.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/pikazazin.pdfIn PDF document text
    • https://totounited.com/contents//files/14620594191.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/706c43298566a172133c3bb342cf92b4/55108727544.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/81911640796.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/59ede81525a3b5540e9bc6c445308b66/vepiditufupo.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/laruvepafafeduj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rn367ojg214m4pbeue1dkta23n/60508815193.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6933344857cdd1ce6b440d2e242cdc7/fawarizur.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f8040528---zazomusikewipuretakefan.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/94029647771.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/psdht3o0tngekafrtiqll5auko/zeduwarelo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83ea90fe6---tubipetoxadisenifatokifo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/msj2kj6pjgppnid44onnjduhbh/21749789051.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e327e8c65963eb973a21c8437ae9203e/vowepape.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/10819115609.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/81570601842.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bopapeligesanarakirafug.pdfIn PDF document text
    • https://italvaping.com/file/zibisidewizamejotonaro.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/zuraw.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210822_083019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+serial+number+microsoft+office+professional+plus+2013PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19169 11576 bytes
SHA-256: fe2a5ca67883a8d8030874e94099d55c06830acad2e338cd1697d7317638c80b
font_01_sfnt_off0001acd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACD0 18544 bytes
SHA-256: 4e9e00c6454b4fe4e445fc3c25b6689a7d04612a747b0ffdb9d5186c4f85bde4
font_02_sfnt_off0001dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F571 16104 bytes
SHA-256: 161c87f4eecc0b02e929d8664f4fa5d79addcdba0471ca3c61d8fd6aa291c773