Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4aa1fdbfc7efd6…

MALICIOUS

PDF

83.0 KB Created: 2021-06-21 16:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6764d85a4ce9b01306b233ad1e707535 SHA-1: a7811fdf9bc0a8f8ec50d24d4e6719e7f5aa4d49 SHA-256: ae4aa1fdbfc7efd6734f4d882e7988208fd980630a33f55e8e2e6ff5464fae6f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of multiple external links and the ML classifier's high confidence suggest a malicious intent to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studiovizia.com/webroot/img/content/files/84552970443.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/12dfbe8b51257c2ac01bd3937d680a3f/vamir.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28801a8a9---tebuligipinezujipamalavut.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/87841f6a046404fe83ed35a93b170501/makilomenejixi.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/929499149f53b6f372099047732f0d75/tubufusegegoxowita.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607906538f89b---40900826470.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/b6u31l9ut9qp73as31len878ji/tefavar.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0cfipkc0cqt6sm4bpvfuuok7if/vawadoxejefeseduvazo.pdf
    • http://mikomisushiwc.com/uploads/files/20840651577.pdf
    • https://actorconseil.com/files/file/34145944369.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7b7c03fd318f3800732aa57dbbca11b7/gerefav.pdf
    • http://ibtaker.ps/userfiles/file/80477028473.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a3cb11b0---18937805206.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082250c2f38b---panewemolagiditulelemite.pdf
    • http://gerd-pollak.de/userfiles/file/gewalurewilo.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6e59b67609d11c4d281c807615ecca78/18531030196.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9d6a4954---wetipogavikizunusa.pdf
    • http://kaitosushisb.com/uploads/files/5885163650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+ultimate+ninja+storm+4+ppsspp+file
    • 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://scripts.sil.org/OFL
    • 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_off0000f003.bin
7062f31b52d4325f921e1f17b7d73e7ec154bd5d543beb59508e8fa5609f99e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5180 bytes
font_01_sfnt_off00010197.bin
914ac169400e9f1f329c6a8a7b3a8f7dd53e8f220adfe44c3ff1f72105ad20cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 11412 bytes
font_02_sfnt_off000128a5.bin
018677660daba8ec6f83366324842d7d88eb7dd6d14b199a8cd9adeab8ded337
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 16284 bytes