Malicious PDF — malware analysis report

Static analysis result for SHA-256 2626bf60c8bc5641…

MALICIOUS

PDF

98.4 KB Created: 2021-07-15 18:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec64a93fcbb2cde24b34de55bb0ee42a SHA-1: dd62f74ef349c84d603f367d3309f3c681eee997 SHA-256: 2626bf60c8bc56419ef33909715fc389f141fd07a789da0de9d02675ad74dc52
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vokitewi.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c824131c5ba160b899d5feb782e7394a/31941938635.pdfIn PDF document text
    • http://fructusartis.com/i/File/32644200481.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/roxedulum.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cff025caf---26367970061.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b537e2f86---88245134791.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b68f9abc34e3f2365247bbc7f271233/pitorasunejiwozolek.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cae3a918a---11963773100.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/visumiwa.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b07144fe1---72075756231.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/tulivet.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23ac68e2f---94062350855.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7d8b6074---69121842235.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e30971300---36090753082.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737336d9f22---8343702096.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/gakurivafafozarumig.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e933a8dbe1fc858769852d9fb695494/bulolubiwogipoxulado.pdfIn PDF document text
    • https://linker.tw/files/mepufijivasux.pdfIn PDF document text
    • https://nevisnews.com/userfiles/29117169763.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/pikebitipukufurogigano.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/23483219559.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee483f5fa98---79962139751.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/63288156906.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xutogudek.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/94417046927.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t09rrn6fif517gjdur1nam4aa4/4240905482.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/36440445224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=starting+dreads+with+braidsPDF 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_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 17552 bytes
SHA-256: eec5233893406e6fd482befa0b57dea06380bf40db9393a50ac4b9f8b54f037b
font_01_sfnt_off00014bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F1 10660 bytes
SHA-256: f84fb3d2821181f6bbae472d133c80173f67734cd3f331771701885871d64e06

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