Malicious PDF — malware analysis report

Static analysis result for SHA-256 33003e8959404e39…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b55607f91241f0bc2cf96977781f5d6d SHA-1: a5530046fabae1021af15dee339afe81e1358578 SHA-256: 33003e8959404e395bf650715273fc186527af6675bdf256304ab9cabd3e195e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=friv+classic+2021 PDF link annotation
    • http://majortaylorride.info/images/uploaded/file/nawufijabexinoxub.pdfIn PDF document text
    • http://119pump.net/d/files/25951630363.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ef79e1f4---sunabifov.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/37189599550.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/tigijavu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/66796610018.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141af6e4f8f5---zelirijosekovi.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nazorodetukiluxelu.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/65054997570.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/tafipukazisopom.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/25376280444.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320a171e447---94585485286.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/furovusikunux.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/4869854045.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/74674594790.pdfIn PDF document text
    • http://biosite.ru/images/news/file/gakuvukezuvubanotosuziti.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j4qfi4b3ubhie1enj4dh2upp87/vezasufalerefi.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fimulo.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/wixofuradoxuvoxowenax.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f090d1ea7e---wexijopi.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vofedojexiviguzo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef2be0b7---49551213654.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31271915470.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613094488a956---47268820795.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tatiputebig.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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 17888 bytes
SHA-256: a48ac4292550f7ca09ec854a55e790ed6048209fa06be2d0ab78b680eaa9908e
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 10104 bytes
SHA-256: 96a3e1873fe521ed43fd3e7f0c465998134f5d40e02913bdc95842a09acf33da

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