Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09d5826a769ab61…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 15:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a80ccfb1179355593b9a74e6a14ef297 SHA-1: 5804048d875c57c57f37f406559068422e9bab04 SHA-256: d09d5826a769ab61cf32540a5504095f32415c5dd64ee5d4c7957d67a8d19973
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mylodge-naoshima.com/26481300353.pdf In PDF document text
    • http://elanaclub.ru/userfiles/file/9553158320.pdfIn PDF document text
    • https://bloc-immo.com/images/xubakudomamovod.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/87074252938.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/13636917806.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/nogaz.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xofurimer.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/058b00c9a7e030106a6c0f86f9ac0853/35349428145.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/75579054501.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/34347978867.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///61397142948.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072438a63446---36156032500.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/25dsd8puuo9rfp45ksgurle2jb/40114207463.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/19896258890.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607664d935501---mekabojogapej.pdfIn PDF document text
    • https://majubesar.org/contents//files/xujikokinigaleri.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0a9d3de842effbd312325746a1679b04/49646097456.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ltrgc8sthqne8jtpbi7oj0o397/31498679541.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/55310931102.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/91794593955.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/jufalofozalumuxilov.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zanejezupide.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/tevurebelatipiwuligakilob.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ca27526eabd8aaab9c8b3158c49bce64/15825775658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kyocera+5500i+user+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2020ebe5eb---ropiwijitefab.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 16320 bytes
SHA-256: e59a6cc32d04a7cacf5e921f93d593b43628e7473256f987049ae3dc7b35c891
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 10752 bytes
SHA-256: 118da26b2a6ad41ec611673b048ccf572d6a75eec6e2132db96c8eec40fd0a8f
font_03_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 19184 bytes
SHA-256: cd787746d6df38ac849790ff6bf5f78683279ce4a7eb6500637d9d5c28a7b8bb