Malicious PDF — malware analysis report

Static analysis result for SHA-256 26360821e3ed1c4f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 02:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec91d73986c8cfb535733f4ae82dc488 SHA-1: 88c4dd70b8b8953043cdce883f7e7ba686b8d9d2 SHA-256: 26360821e3ed1c4f5c26e1d6b6eea6fd875cd0c58a0ce973a35ed7847b747412
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used to redirect users to malicious sites. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://suprizpin.com/calisma2/files/uploads/53716466466.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/59412622790.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8141d08903a6241ad0c762e65ada7f23/90370266836.pdfIn PDF document text
    • https://grandegroup.net/files/42215155633.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ecc69cc8d3db5a23f270313d9fef8322/kerekemisuzupopuveba.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/81305241956.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c4fccb9e11b794ff0a08cd574baa64b0/32171107258.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/36766098083.pdfIn PDF document text
    • http://ciskmv.com/css/file/29827760233.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712abb72bdc---53535785288.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/88689374752.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32a5a0e1e---jolozediza.pdfIn PDF document text
    • http://gibisch.org/files/files/39430528049.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/woruzedujagimudunenu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/kufap.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/zezawuvidukunip.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/74896962940.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0e37d74c---82810429599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bcb7714fc---6138065242.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0e38ac06866892c9fb67d0309d984096/87845281245.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718d3b87249---69519178643.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/jeromesutujemiloka.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vubedesadugigasezigojel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=decimals+to+fractions+worksheetsPDF 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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10780 bytes
SHA-256: c5fc5a9cbc6fb632375617f409d0928a800e5a7b6110d4f8698d2ff4ca455880
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 18828 bytes
SHA-256: b667adaf55d8a856b961ad24a4fab74fbadb6b8d262cdf123e6b79041400f337
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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