Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f65bb5a76fba32…

MALICIOUS

PDF

88.9 KB Created: 2021-07-30 00:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73b374c774ba4403ea26eb92a59f2e00 SHA-1: b82d7201b895738c2e9bd57f135d7ee040bf831c SHA-256: c7f65bb5a76fba32c06a3998a4522c330b005d31fd7623ef7199e453fa086f3e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is intentionally structured as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=hoja+de+libreta+cuadriculada+para+imprimir PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/360779230d73244be074f9b6151ada47/93673345274.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/disogifimejosuk.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccdddf541---sefonowu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/dofopuzirevutowikokukokav.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/losilo.pdfIn PDF document text
    • http://moristas.com/userfiles/files/77538858111.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/44971737205.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8337039b838b261f33ad7efe20c4ab4e/tamuzunan.pdfIn PDF document text
    • https://starbox.fr/img/files/59868971283.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e252065e7bccee51861b1dca8c205e07/21149937601.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/2192245154.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/93263248556.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6l0qabe7sbehim29svob86uhm5/jerifubuwopore.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd27394d378---wanaresivelegusuvigako.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8ugq9g8goqflll6415ej3n5ggk/58531151740.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/likifatidigobama.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac25ae09fc---mafanupenabovotikapeme.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/dolewufasasu.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/vometeve.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef18415f1---1898835569.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9soihtoreugegifk4okk3mho05/59977747720.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jereke.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430b3c7bd9---71672522077.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 19736 bytes
SHA-256: 95ba505a29fb86e5f752a6743ffb15d62306a4a1b7f71387daee8287751c2871
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10764 bytes
SHA-256: 051b76271904aa4efb5ff11a4e3f89636e5acee2fab937a7de602bbbdf8bf08a
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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