Malicious PDF — malware analysis report

Static analysis result for SHA-256 35aa4aef8f39ee6e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 13:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c69e6bbf108ba339c3a466eef2cf8a89 SHA-1: d3e194a2433ab69f55be4305dcb4f5b9de22eb75 SHA-256: 35aa4aef8f39ee6ec53922b689ce7aca745c996fc9e6d48911c8ae99498fe7ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, a common technique for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links and the overall heuristic profile suggest a malicious redirection attempt.

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 https://dp-silver.com/userfiles/file/zatabetonowifuvexiloduk.pdf In PDF document text
    • https://associazionemusicaviva.it/uploads/file/68220145718.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210917211434.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/40688988300.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/54115825267.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/lewomotenufovuwufevewetes.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/voresenunepupe.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c839c2210---risomen.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/tekefavuw.pdfIn PDF document text
    • http://dges.in/userfiles/file/kexirezuvodiguguxejijo.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/julubatevelu.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/pitobikonobasefemilovaxa.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/77132352406.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/gudibisumadetogelo.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/15722831082.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/fadunuvelukaxalunegod.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908153336_1907520277.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916062917.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a83ad5da3---33786399171.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3d47310c---mitafasogodoj.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gakudosozupax.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/72146583206.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_184804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=handy+gamepad+pcPDF 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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 10340 bytes
SHA-256: c38ee71eac39612e7d0668655cc5fc55e2fcd5222b39e73c7045266a76886a31
font_02_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16364 bytes
SHA-256: b120bfa7709aca814dfb55aadf37fbaafa1ae161d0307c58bf9bf9c5fdfd4670

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