Malicious PDF — malware analysis report

Static analysis result for SHA-256 c408fc55a5fd3d7c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9642ab1c19c884f71b65ed457039a0f8 SHA-1: 75825ef0d44def0355251e1ce0324b117581dd05 SHA-256: c408fc55a5fd3d7c17425d02da5f5fd01521798e1360e5979b12f1b2be105d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/605866a8198dde71caec241b9737f185/xodivu.pdf In PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/7086869151.pdfIn PDF document text
    • http://veitali.com/upload/files/95819025661.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qf083079k5s74tan1v41q84orf/wuzunovomixogiduve.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/59702908801.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210814031704.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/69898186891.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/25874350051.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/22/denafal.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c7118386f343f3eed66cfdb206a3506d/jujeduzibiwezeko.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4b2032bf396616327edaf24dde1c0cb5/40633407959.pdfIn PDF document text
    • https://nexusmediation.nl/files/3783593184.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/57298362654.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab786cf56---87090359652.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1863881d3e---xavuledagexizipabomafake.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26826c0088---39309267348.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/tubatu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/90150b5ed1b0e4a141fdadbf9663fa2a/xalowigapeporexokapi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/zunelodosarajadu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094351f611c7---buzazelep.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/99762610313.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/50111774906.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479160a8f7---bogawomafadikam.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/557546d5106a9a5c781015b2718084a2/famijalulejufuxevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=scalable+architecture+for+the+internet+of+things+pdfPDF 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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 11216 bytes
SHA-256: cebdf8dde0439043e6a092db3f160229ab4739ccbc21613ed20e62ef8d4eeeac
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 19420 bytes
SHA-256: 555a420235ee61f793e88f862d928aff7cde6a6116276dc3915273b176fe8f76
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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