Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd71094ab4d8d13…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 06:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6b537efbb20bb3b35e3403cbb17e5f35 SHA-1: ecd7124a30dcf92e302885073de88ad17af623d4 SHA-256: 2fd71094ab4d8d13af0253117508ba678c7258cd1e4edc05ed4c2a6b0d2e2c72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=midian+in+the+bible PDF link annotation
    • http://airzo.net/userData/board/file/40017795140.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/wefuju.pdfIn PDF document text
    • http://snft.ro/media/file/lofededuvetojifisizixa.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/29241109197.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/27772709002.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9907eac91---tigow.pdfIn PDF document text
    • http://jar-ted.pl/file/93964009980.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/12358291039.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/lunekuxabozarufutixeze.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/39740009565.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/21416165893.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/81134718831.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/mowofewamofuleput.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/24710181616.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/sevurakajarovalov.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ak8ajacmjeplr0egcp8sdv803n/98009612570.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1615f81431d346---24511184234.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/77271091527.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/12489560686.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/30124259222.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614051271e2a9---70723951794.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/55767204006.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 10092 bytes
SHA-256: 42697595142ebdc156e4fa507dc72a87c4d477f810befd7e4d56b1e9f0d0b7c2
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 20732 bytes
SHA-256: 90fd95106b2c28e00e454d96620116ba7fa6a3266079592f5ea781ffd4fd7a3e