Malicious PDF — malware analysis report

Static analysis result for SHA-256 af63b99ca693a3a0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 00:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40ed1a9411bfdc1a0649d4fdf0890381 SHA-1: 130c1f95d6d7663c91b543e61ade5610086ce180 SHA-256: af63b99ca693a3a02382f3e1cd13e9d6cdd6e93fda583eda4693dd2289e99439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, leveraging compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://skncn.com/u/files/22335981022.pdf In PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/sufesug.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jiwisuzofep.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/127dfc61c55e7ec3f9a0c00a25fed09b/defali.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/1115258009.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/81512599833.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b8cb8fc14da---momojodetagepadumopezuxe.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/10288611819.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f2c657653f38c34d1788bd0d34f6a36/77347748382.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bece8639fd6---vozijose.pdfIn PDF document text
    • https://mszukam.pl/dat//file/diwod.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/xefoxixokifomofokilusuzu.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210509104936_969996332.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41221135791.pdfIn PDF document text
    • https://autoskola-scp.com/files/netikosigipekol.pdfIn PDF document text
    • http://strandedtattoo.com/file/83222092684.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a2dfff9eaecc631a880799ff80ad8703/71421358416.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcd757f15e---72151049791.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/bejuwelonerolejif.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/66697358725.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1114fd8e---raxirikawiradibirapik.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/52567872251.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce62c191cf---52929399132.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c61945820---bedosasukirojutukelew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=flavio+josefo+livros+em+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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 10632 bytes
SHA-256: 4c270775e806d14a681fd179d98aa2f5db89ce789218c31cebd30f0a4b610fe0
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 18772 bytes
SHA-256: f22e88ee57807bceecef985c292e908f1f0bdfb8b9742e0f2d323f1ea184a282
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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