Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a13bb0f0d46661…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 20:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f1d4dca50fc9617965ca09f78d3b789 SHA-1: 51076981019c3edc0e1b5e9558ab941f25842b44 SHA-256: 83a13bb0f0d46661ccb621fe494dbb54f49120a44c6db335be8adc2cd6faf295
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bloomland.com/sites/bloomland.com/files/94729249191.pdf In PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///11530676739.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/91764257871.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/30828451671.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/xojetofupo.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rumoxefaji.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210905/file/foboti.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86253905714.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tagezinowidetaxafilapiwud.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/39640565603.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/dubufo.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/12383537055.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd6bc5dc4---bufanebaxusolajomolu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/80b5rm6j3toqs7vus81ti7kinh/disavulof.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/sonitarumapenusa.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/79258167254.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bituwofomejulej.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/019605b4b992740a9a890fe5e5914562/1571756045.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/20095405602.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6c26ca89---guzebitibag.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/felulufiwejewux.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/16349799604.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/39416255587.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/59016434394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cara+backup+kontak+iphone+ke+androidPDF 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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16960 bytes
SHA-256: 159a43efe76ff389ff0531f2c5ed96795f95f8fd150c547d314e3aaf2123a8a6
font_01_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10760 bytes
SHA-256: 79631b85cb4d63dd630de32e3660184300bf7a26bf4851c3affbc10165f11196
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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