Malicious PDF — malware analysis report

Static analysis result for SHA-256 556ba953c0a126c7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-08 09:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0eef2e9c8594899c800a3df6deb49e7 SHA-1: 164b013f62de0c237c5b5c433b2c2095226e09d8 SHA-256: 556ba953c0a126c71d46b1077a02fd177f19b2a5e1b99c770dc7da6fc348b471
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may also be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • 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://luckdidea.com/ckfinder/images_store/files/zovakaravamutodi.pdf In PDF document text
    • http://inphuduong.vn/upload/files/venunofegef.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/28f81235107356bbd805ccf125e2561b/1786195527.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/74847038111.pdfIn PDF document text
    • http://klaaswester.nl/img/file/41398311993.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/losuwapolivilojutiko.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/sepenafimivafunarajadogu.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0b2264d6615750c82e9658783f6c60a8/xivedekimogumojuginodeli.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/puvikuxaxofawuzu.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/nebawimomiregulif.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/tavexugedebowigitide.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d513eed7bb---45342095899.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/fdc9ed6aa409035bdcdd21e50814f6c9/74161215576.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/25484217203.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/dd67b5abbfe4933455cc5b38d81dd996/93163330314.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/88116146358.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/mitivovuwurowes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4747dfd13---rizamufopelabikig.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/61801910.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cours+droit+licence+1+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f6633ac8c30efe293c863ce5497eeed4/66596095552.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10632 bytes
SHA-256: b0e324c6f1573a3e94369c29f876ea1ba81e2bbe4c8bcefa7cd9829bd0379485
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 20876 bytes
SHA-256: 941b841e3039bbb6c5163b4e0356c5fc9b48dc08ced5d9114e86f32ce9d74250

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