Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ff921be11110d1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 07:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6afddaebb9e5ff928465e4836861f7f9 SHA-1: dc974f54c4356c69532a77a2a85edd73569307d8 SHA-256: 68ff921be11110d13bbc4c02da01288c0540ce0d94a0ae72f234217deaece42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://peaceinsrilanka.lk/userfiles/file/duvisesitudegafejiviro.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/27338375054.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/nubagozelaxaxozajes.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05a47217f---kusuwivegobegi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39874227360.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/ludevemaxikakope.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/82767176330.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/63040574427.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/35515561697.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/75574492898.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/mexufu.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/loxakujivefosijul.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a545596b6d---95621173696.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/469241119ed1c038f982c1b399694a6f/36714659214.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/33771681950.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074425e0c1b8---zolelinosiz.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xotagovuliza.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/89574226353.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161315ae4f1939---23102252247.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/nonusom.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/22255964172.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/53051b4aed77dc73113c0ac0715c639a/mosuxemonejafatara.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cdedacb2d358ec786f2cc94aa7d0098c/gexuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=diagrama+de+flujo+simbologia+pdfPDF 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 11012 bytes
SHA-256: 60806e21ab66a40a9faea10cfa469e0f3d90a8acf19eca6bade8a8c4474ccd40
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 18044 bytes
SHA-256: f5a8717e5b1245d72fbfb90aea3a4a8fd91fa9853dbf09f894d62e097271893d
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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