Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdb609526b24a50…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b88325c126aaf25f70a06c549606c480 SHA-1: 90d0544fd2c2022718490595900e6dbac39396da SHA-256: ecdb609526b24a502b6c64feb2d3ed604383f67e8175ec4e8cc93474a65620da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://jamuiboe.com/webroot/upload_media/momodepixakuvewudi.pdf In PDF document text
    • http://atomiccm.com/userfiles/files/rodavef.pdfIn PDF document text
    • http://m2m2design.com/userfiles/fomokinogigomobakuvod.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/fabiwurepubidoxowerivu.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6f81eefacc68d0f92f164c054043d1e/takizetozexolitivozigap.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7b844d45---83328822584.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/54489013598.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/befexazexinenimidifabu.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/denimixonivapezajaw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a048d884---9912607931.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/22059778924.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135189850908---wugirezeletitusoseme.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/22964812449.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/31838c50aa37f8f78ae61adda21afc81/befikufulade.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d984bdffad3518072b462650eb95d629/15539909884.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7625ba20---72039846192.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137808f31c2f---36014279744.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/folokulusuxasedosokoz.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35365872050.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/wesutajiwulero.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/rituvexuvelavop.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/bewagomejatilesed.pdfIn PDF document text
    • http://rafaelokazakov.com/file/mejijaposutiwukojupob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=godfire+apk+modPDF 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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 18476 bytes
SHA-256: 3781abdab62811f235dd88dda2d317081e9b3463846c008897a76756285dff53
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10372 bytes
SHA-256: 7f12a9a400de7d04818a47243facb98746545dd844067bb3b53b6f1470ee3b3e