Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ac23e4373f4be6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 23:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb10d3be9ad6f414a3004273e2c54214 SHA-1: 2f928d5aa38d63a23a9ed57a91442d8528c25a7c SHA-256: 29ac23e4373f4be6d5ba12ec0b4a49e9fc2e54b830f4f39f93e9dc1a4617b311
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting. The primary attack pattern involves directing users to external sites, which could be for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://epwuae.com/userfiles/file/79257984652.pdf In PDF document text
    • https://yukkumpulgroup2.com/contents/files/riroxebet.pdfIn PDF document text
    • http://domplus.su/userfiles/files/rujidekiriguzujemozag.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e801450fce---17945909438.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sozetidugigenuraxinexadug.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gitaworidaruderofinaluliw.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xazabiwebulefe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b513e64864---78215490044.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5b1a3d32781b426db7e6bc136d588972/gomonusipewogu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/soloruto.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/64465184726.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/87836516812.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/72748650675.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136533ccb504---kexororiledoxoripuge.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/68803846970.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/midafuwida.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912204820.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/jupabuxapel.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/botezubatidugilipive.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/72459942382.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/90562854904.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/99281062864.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/25076565152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+a+word+to+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_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 10368 bytes
SHA-256: 4f34386780f404f1f0eaaf98bb171369264df2e44e1529a762e52c919f8fab4c
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16352 bytes
SHA-256: 65a06abd54c471d08cb0bf8dbb475730931d3281ab2a89cc1a45722e434a9864
font_02_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1