Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a82e5e74c541b0…

MALICIOUS

PDF

78.9 KB Created: 2021-06-30 21:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7ee6df51dce28b948f2ed4e3300fd81 SHA-1: bc607aeaa050a3bf88c2e685f0abd1cb9734e6d5 SHA-256: e8a82e5e74c541b009af6085855e40418b4bc4eade1241128f85000c75de28e4
156 Risk Score

Malware Insights

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

The PDF 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 CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lapawan15.com/shop/fck_file/file/84669632102.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210627115239.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/479bf83bfbb76385c6b5989112ed1479/sudejapuzef.pdf
    • http://teckim.it/themes/userfiles//files/9836947400.pdf
    • http://koreanhotpot.com/uploads/files/10110353670.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/146a8865488ccdf5df84136b88facfa8/68209772538.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/40207dcf03f0a7afe03658526641b5f1/80716177946.pdf
    • http://saxonrt.hu/img/userfiles/files/solebi.pdf
    • https://secolink.sk/userfiles/file/seromofutixokesama.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0f3eacbaec897366cc627aeb94d7fe7d/rulofipisekogeb.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989205448cd---14964109906.pdf
    • http://eaas-journal.org/survey/userfiles/files/83967932649.pdf
    • http://oodow.cn/upload/file/210630192428111968u0eao6o8ak8g.pdf
    • http://dok-vo.ru/userfiles/file/86542194707.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_C6C5C84AA0C355BF.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331f6c78ef---fasugoxetomezavoxipunu.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bfff7ca04b47e6f1b6073a1e158a05ed/pubanibulonikafedazol.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/65185224981.pdf
    • http://kolaykanal.com/userfiles/files/venajufizukimubisonagux.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7704181f8---94041021117.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hq110ikv030tbmuvajfoqmn6vd/limituv.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7e6c3ee83967398a3b4d35e417edcd1f/65828862067.pdf
    • http://cathugo.de/res/wysiwyg/file/sofogozudubu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b95bd2ce9f620b3c0b5dc05686f24ff7/22618537248.pdf
    • https://airbays.com/userfiles/file/lezagozigefax.pdf
    • https://parklanehotel.asia/userfiles/file/92309268474.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pirates+of+the+caribbean+4+full+movie+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf78.bin
810c992024090114005a5944a5c05c2d0931772bdf632aab66c81f968903b3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 17296 bytes
font_01_sfnt_off0000fc42.bin
3dfce33afdfa58cc0520a61c32acef0cb75b05dd7ee80949d92d9ec83f0592cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 11072 bytes
font_02_sfnt_off000115fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 16792 bytes