Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3227ace84eabc3…

MALICIOUS

PDF

95.1 KB Created: 2021-07-27 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f2270e0d6cdbeac9708baaef161ee2f SHA-1: c2a340bb5f718614f58278fdf57a1584974e5415 SHA-256: 3a3227ace84eabc36a654c665cb27fb7fa610f6dcafe6a19e74e6981d1ec3d3b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kabelkyaobuv.sk/editor_uploads/files/nenugenulifaboxuno.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8q4s1mrpt4qmdnai4egq36hli7/goturago.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/bawegopivuziv.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/muvagoxara.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/xedanugupi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a11eefb0c08---welulirof.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160983249d4232---20476540751.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/kefibopokijuvijoziregaxi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r94jesaabfrlbr36n0hn3ucmbh/14284224634.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce6e47e01---pozutogokax.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/utt7jfb6a7al84h7ti7e4t1uo1/64937711809.pdfIn PDF document text
    • http://rld-carbon.ru/file/96606381069.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8fe0a1df---devetozefusolikig.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983992d6597---mamama.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/45720737354.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/98944961097.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/sududajiwusinuduni.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fonagazofelujufofut.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/db59904a1bd4954d0168917a2300ccc4/91766725557.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xuxek.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/64070959381.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b10c368a7---7479235668.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/lufibodazuwusujirezimaj.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mekiralulexolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=winter+2020+to+2021+predictions+new+englandPDF 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_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 17236 bytes
SHA-256: a83653800dc564a51fe50cb40fb16175aeab110ee870e616ce7818329632a718
font_01_sfnt_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 11064 bytes
SHA-256: c44168767b69dc4e8f1a206283172a6cd497445f5cc5744f2e7d3106d420af2f
font_02_sfnt_off0001565c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1