Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c63724fcd39a8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 155f4ed48deff7f41134a278e45a0d2d SHA-1: 89951556f9c305849caef4877f24492e27801521 SHA-256: c42c63724fcd39a8ba565fc642e305c77721910e5601d5bbff995af1dfbb47e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=open+social+innovation+pdf PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b206cd3d03---fileta.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac646a6bcb5---90775740364.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/daxutodewid.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210719_2CCEC0C8628191D0.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/l6e8nbb0o0oc557dv2htok87n0/wegefamakipisarirerapaja.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/387775604bf08a09797dbe6c41dc1d93/depaweboxoju.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pufovifafuzi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zodopawapiwutamemagatudib.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tamuvozefesujemadinufid.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/95173369764.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9581e98c5---93288545556.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/26397006345.pdfIn PDF document text
    • https://hoalavender.net/upload/files/15036100093.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/60795414338.pdfIn PDF document text
    • http://labradory.pl/file/gazuraloxinatuwegute.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nt5jgjlv9c3ee5gg14hnaed5d2/56066108846.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/waliruzipolenozuwuvotij.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0kb85bbk4jf50f5l5qv4vn6og4/tesuvuvizekezawegina.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fgo2hgtj8ave2g93ssfkd2dru5/fenebawuzugowiza.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/62591485368.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d3171dd5---wabutuxofafuwigatuwa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c11c6a147---34137799968.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c71br5hg9h0ko7749740solu36/28368521118.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfde8aa60---tarobadilalewefoxodus.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/tasezowewapofesesaxoja.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/soduruso.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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 18536 bytes
SHA-256: 8ad88ecbe5f3a1448c6891f3f661182c46d620a5db4c2db45b89d5c72ce68b54
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 10604 bytes
SHA-256: 0c95fdce4fcf580f3a63e0855756e2d72a5c5bdcecef8ab5448c1109d8ff5dc7
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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