Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de8903c19ff7b6e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 15:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64030d9c66a791906b439ffa4c496aa7 SHA-1: f143f006c4bd6655573ba8105ccb097ec165f1b7 SHA-256: 7de8903c19ff7b6e2a8f20a50146845fc3a914ed69cf011d5769b2d913c2cd5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL distribution strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://studiocalderini.it/userfiles/files/35498251945.pdf In PDF document text
    • https://rotitelor.com/contents//files/33144310288.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/dipojebuwomaxemifelemes.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41866d29cbb8a36508168c4021ad2c2/95134096625.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/56720383293.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62b4a263d---fuzobevifeseduguze.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd61368e0---25545912685.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zikafuzofiviladatar.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/11449090505.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/bemijolisaruwituz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mvipncrvbg08esv36pebc2irs3/vosunuvasomus.pdfIn PDF document text
    • http://12shio5.com/contents//files/wepozirojeb.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/45e29003cbbc0e953a7d31437d8b1c56/8154244453.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161168fc0b81fe---buluzapasob.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/jejelifotapik.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/20972504154.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/84112729233.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/lefusurelajokejir.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/su58bo52d7o0aq8kq4jouaelg3/kowepenigarosezevipotavux.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113db34b3c4d---kezidijavigasapas.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4be75be8946838fd46d24d2973fa4e9/52784327912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+printable+worksheets+for+preschool+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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 11012 bytes
SHA-256: 27830555bffff634e1d9d6c45f792206091cabefaaaf714fe7de26bee7a695dd
font_02_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16512 bytes
SHA-256: b398e8c5ccaff923beba6faba09803bd78d613cc5a3b821e3965c408971fc0fc

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