Malicious PDF — malware analysis report

Static analysis result for SHA-256 364bc276c18b9d4a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 14:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbc61f2ecb097a5581534b57bc244de3 SHA-1: ab4e788be9660adc81ef88f59c3d84592cce8393 SHA-256: 364bc276c18b9d4a755c7661d935d910a28549ab6927dc93d8cd51db7575dcee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the detection results strongly suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ciela13.leaddeehub.com/userfiles/files/basis.pdf In PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/75834181529.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/81386559128.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gemojisokasasume.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/waniradabe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g25ljfuhhjp86qa13lbq5j217n/94883093070.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/bosarasisapu.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sazawixi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b998f5eb---72443731548.pdfIn PDF document text
    • http://slsnn.ru/content/file/fusimuk.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aac38ee1f---zesimixatajawe.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/filufotamamaxawulub.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909220441087.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mikurovegig.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/69198175669.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8u0g3fc6oeun2i1t6crdbsn901/vafezufeta.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xepekes.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/xokak.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/5931109209.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/risukenu.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fevasaz.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/16666414033.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/nozugekazitevigesiga.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lirasowozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fota+for+androidPDF 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_off0000c4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C4 17240 bytes
SHA-256: cffacd256a2d5a305dc90619da85779670ea653b4e74b3498e2efa5f5c768c78
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 9976 bytes
SHA-256: a775bed93016ca13ccd3a6ad71e83fd6797df4c45b7bd4c1c7e4be4b53b4a887