Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dbb3227cff6f95…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 02:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc1a87c57288c706b3122662db47f7bf SHA-1: ff6e350362a27f024542c08ef7cbc3182279e364 SHA-256: f9dbb3227cff6f95decc38720b3d97463d37b37c91ce61cb32a67e08c996a3b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and link farm PDF. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=valid+credit+card+info+generator PDF link annotation
    • http://thebodyclubonline.com/userfiles/file/mijefefupiviro.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_181203.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/30020728474.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/28820117920.pdfIn PDF document text
    • https://kimcert.org/E/file/21484200334.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ooegh2alc4j5qjufncosrfq75c/16424497513.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/tojuxoriromolemar.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/ziretuwodofot.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/fibamajen.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/mivafisanupozosexebo.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-22/images/files/57998123026.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nilekelizemipud.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144b11ec49fd---55464356659.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/55791431029.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/gapirenabilopuga.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/fimaz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173944746c---molisoxogufotu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161488e22df95a---sewaxatutemanilixubiti.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9f702c9d4244f987db92f78f625f3e76/58921220411.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gefigux.pdfIn PDF document text
    • http://banquat.com/userfiles/files/bipusigelalozimo.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_off0000abd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E7 14532 bytes
SHA-256: 3e79affec4251b9d141f805beaaf84e3b8334374c8756025a552f8fae3035656
font_02_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 10452 bytes
SHA-256: 7299d559c0b61005769a5a44d69204bc959cba1e199ddc0883f664d983bac3d8