Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a90cefa41fefb0d…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 14:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8607d13e816f8f6b800a1e117c496687 SHA-1: 7786b96aca07d203ca43692b816efd028bc690dc SHA-256: 6a90cefa41fefb0deeffa0673c5068878fec29fdf260669696653dfaf631688a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential tracking/phishing aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fb33cc4---20123491772.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/6ca1c67cf73ecb2fe3783d48501a3b5f/23937018448.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b257825154---31833794742.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/85831183259.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xamakulut.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jfj04si60buhduuurh78nuh6q3/58433508057.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/25622191894.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/338731600.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xebosofexusado.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/41438658005.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/wuxajavatotojot.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tukopubipixezuvozafu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b64bec64c2ea07437c8c2e2944304864/raparovelu.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/58984343487.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tomula.pdfIn PDF document text
    • http://ipceurope.com/assets/file/jemixakurapeziwe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392e3399b5---konurunikidorexenefozizov.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/66c633475df9a0d617b4f695e9ec650a/69365228982.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/12740653671.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/vefiguru.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec2e496e7bed89af410130a561b02e9a/98677249053.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/81449706924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=training+for+voice+over+artistPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10492 bytes
SHA-256: 534fa052f77e52115e69bda94824108a6c46d58ce4a3123811eadb8f2ebc44f8
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 17424 bytes
SHA-256: e127aad72fa7cfc58024cd1d78d5956a05223b181a6b9fa1299aff5bb86f6b68
font_02_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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