Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e3307e98352986…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 13:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7ecf7ae75f62d81166f1ba43eb0f049 SHA-1: 72df710e932a131b5825d874457e0c00c50ac28a SHA-256: 05e3307e98352986cfb23bb43c819d6a9457e0ce46d7aa5ab2ee1ad5db088b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of a link farm and the overall structure suggest the document is designed to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=best+trucker+pro+mod+apk PDF link annotation
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wibesefuvutarofoseferez.pdfIn PDF document text
    • http://www.polni.si/Images/files/36214745.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gatifasaropudafilefa.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210905104613.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/46400383042.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2d5adceb6368884781116f67dadc9074/vukugaregalezuli.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simet.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/vikabadanu.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/senatifiwelijoguwikiju.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/73383907558.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/51246872110.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/15040622601.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/babatufefojodopekoxawagim.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rezaxanujarivevaxi.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902100813.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/26391820446d36a56962f55f241c856c/rupamudoperoxegoxefinewav.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/97824446266.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/setezekox.pdfIn PDF document text
    • http://orderkai.com/uploads/files/poxifo.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/10618145279.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79126a8be---4636340160.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613565bd52da4---betituxeratenoxumaveru.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/81147270435.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_off0000b266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 10676 bytes
SHA-256: 7439d77ca8109bcc1832558e303fe84d11b81eebc6ef7c77453b210ceb8ac957
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 17208 bytes
SHA-256: d71c56a695fee72da81943fab4461215828b36a3211be0bfc90464f4b46d66e1
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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