Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97fc9793138927a…

MALICIOUS

PDF

77.7 KB Created: 2021-07-15 11:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72b5d6555a00522e549ef1480a34d791 SHA-1: 66670ee59dd15049ffc56f91f43abffd7c82c832 SHA-256: b97fc9793138927ab45dee13e023916042c1dfc90211a6735a16517d1a14a29b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e83329218---sesafireje.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/duvixavewonisiw.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/76364497801.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad017086dbc---32582038184.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4634d94d8171d24a803ddaeeafb24bd1/74242873720.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e271e116---94408502543.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b1dbdcf4---witejogajilu.pdfIn PDF document text
    • http://vtaky.sk/media/file/lugibibewimu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/72405036952.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/79624310609.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/pepur.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/12764746565.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/37059525408.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9j5tmdmje365rionm0hmnm35qu/fenapoduzomuvirupekizak.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/15119612841.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16229199607487.pdfIn PDF document text
    • http://sbkf.org/files/files/37429590356.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4ghb1hh0758r1q23higqamgahr/23665111419.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c804c0b---70316606204.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cc8115430778d4044b9b8c48eaaa79c4/rujulesewimukanejima.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/42870637549.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/57796746386.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c82c4072d000538a90db4652785b6c59/xawedelujoxosuwasopi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h707bnvon1acog5aa405crp560/pipebofuko.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ga8nouq7m5vi2vrdhma153nne3/60106947746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+season+2+episode+12+eng+subPDF 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_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 11336 bytes
SHA-256: d468cb2981c16474dde0e729050d06ba3fbfccc3dc2fabb824fe81c5496062ae
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16804 bytes
SHA-256: 0ef438810df5cb5d3985a175d3555b0f212f381e7eeac34958e3deb0299e5333
font_02_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1