Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ad8b1b5c6a5c85…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 14:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa371ef8fc357bd1b0fce0346ed06916 SHA-1: 81391757fbf09d421cc5ad77fa5beb0196b3aa0c SHA-256: e1ad8b1b5c6a5c851dd52314872cc8e3bd19db127b32f1f445be5449bef3d1ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=usb+debugging+in+mi+note+5+pro PDF link annotation
    • https://noithatkuongthinh.com/uploads/files/fowisuwovupo.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/60288414454.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/822443c8e8a122cc02e6694b1e5d2929/31291424226.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613036f357b09---baborubexobedubuwumaza.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jijerukebiwepewemazuki.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d927f7b063164237b5f258ec376eea68/sonuwafal.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/86418634725.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a624e27b---48153391232.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/sakipakasifo.pdfIn PDF document text
    • http://surestegc.org/documentos/file/93218860163.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/86761142634.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/33594678178.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b114e1d1---diruwatiripemosowu.pdfIn PDF document text
    • http://eventechsite.com/files/files/zovovomutolav.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/siguku.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/tawaken.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/76920236688.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/xefokoduge.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/16e2e952f3fe0a4b4bdab63e0867ad17/74705928112.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/91509940338.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/77560295377.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/wovilajitofudaliturajur.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/22617740016.pdfIn PDF document text
    • http://apart1day.ru/file/20107281159.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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 10908 bytes
SHA-256: b996d74b45f5c4ff841888488f21d0c7ddc3259d6acd2c0412752272c6c79062
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 17688 bytes
SHA-256: 736f9d3a453a12c950ac8993e9f230722ae1fc9a741881ee282480fd28613e89

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