Malicious PDF — malware analysis report

Static analysis result for SHA-256 d850b156067a067b…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81997ed61f6d3d3bf976c4637efdd7b3 SHA-1: 0fbd4d88b9e792f5258101c076c63c3220152583 SHA-256: d850b156067a067b6813dfd520a644c931f62ff729fe34c6ba877b918a063d6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting an intent to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=love+quotes+hugot+lines+tagalog PDF link annotation
    • http://hoachattn.com/image/files/8138382622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118091c0bb---bipowalid.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/fijinajatijijuzarew.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/tilusemijowanawomogisoz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffaf8d2ad7---dexipigutudilobemebu.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/tisusujiginufi.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/juwipanegewuwujeponamu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/82368848839.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zunikinupuzojudubakeno.pdfIn PDF document text
    • https://777mto.com/contents/files/62482963010.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/tefasedagazidalesan.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2206b6ad4---jemapapo.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/saxotig.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_6E077AFE37272156.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/75614183745.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/sexopisesego.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/gesutobiba.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/pegevuvirawetuge.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nabanu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/lilorove.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kizogurofezi.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/35666275504.pdfIn PDF document text
    • http://yibetter.com/data/files/rupulude.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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 16100 bytes
SHA-256: 69f745080337b1015d9af65cc9c49f8c13beea9c880f6a4ca39f3379320e47b0
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 10556 bytes
SHA-256: 6f92c00e4ae6ae639e9136dd41b28e9fcf69848fc8a525bb78b802fab365e26a
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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