Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c93a3652afe173…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29486b9d08d2e4564deb2511c346a0ff SHA-1: 94a95687ac25185ec2d4dc57c1119488b4d220b3 SHA-256: 77c93a3652afe173f8f7970e353bc5385a7948c5ab12a0e4176d1d46061092a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'link farm' heuristic further supports the attack pattern of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=like+tv+full+apk PDF link annotation
    • http://kerekagy.hu/UserFiles/file/8186709899.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dffcc316c---rinojisesisugenerojava.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/fugexodul.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/63713479047.pdfIn PDF document text
    • http://full814.com/upload/files/81981489027.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/36272460932.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wanefeligom.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jopenuvenivuvujalugasog.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/96398371137.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9b20b3c53ba227571c1632e6f5321236/weveteguvedapiguvomiwa.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/60281232388.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/kirewomomodamofefedoragor.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/25837368526.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/18146354186.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148129cbab13---xuxusi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210908214350_49iwjl.pdfIn PDF document text
    • http://etre-belle.su/images/file/xuvijalazisotu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/34303364575.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/29973315423.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/7862865165.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/69928973997.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/39817595349.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/zimajikabuwadanepudidit.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/kefupibusopom.pdfIn PDF document text
    • http://megalaserasia.com/upload///17188705845.pdfIn PDF document text
    • http://seritour.com/rsm/files/nakaganivonuxozosaz.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_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 10072 bytes
SHA-256: 28e994bcd2c03df9f2c5e71c50773006abc1d15303977660a3ac1a0dc7cef059
font_01_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 17524 bytes
SHA-256: a3e316b1c3885c1cad67c1ae0ed9cfccba714577b76d6f8e60e6ac22bcb52b83
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1