Malicious PDF — malware analysis report

Static analysis result for SHA-256 6559db626a4d317c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 07:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf98908681afcbfbab732863b748bbdb SHA-1: 90b469a01d3dee049920228c84cecc1a8f9fd183 SHA-256: 6559db626a4d317c56f69057fb696ebb9995f3505f22103039335c8083ed810c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=sample+resume+for+diploma+civil+engineer+fresher+pdf PDF link annotation
    • https://mimpishiodua.com/contents//files/85092322150.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/67479cf10c7f279753a66de2a7e9f1e9/refixikojabuviso.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/46594949762.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ebcc544f6911bcfadf78e7170e5d143a/wuderas.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/laginat.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3a347541285b01445761f76af784ae69/gabob.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vobugolug.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/xasepinox.pdfIn PDF document text
    • https://shibbirs.com/media/files/walesubazamogebib.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/mapezidorarapinogupoja.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wizonatalozuka.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/drn7dpvph42lql5mqmvcelc2t2/95866257720.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/pudavusutekemumimukam.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r5oci7ulhoaenjveegrgu32qmc/depimerebatujojavegeza.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/6386430742.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70ab17a53---goxojepuzuvedelijalifar.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/mekivutozadarakofejela.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/40137295502.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c5235ac5---sutixob.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/44882687416.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fa375cdea2ddbcf5a2bf7c9897f8f9e/88860122257.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/xatamenibapis.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c758736b---rures.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6f5cfb792e8252cb3dd7d0fd4a9b900a/kitejobajikonenavaxafes.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.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_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 11212 bytes
SHA-256: cdc9cd338bae21f7858a53bffee019397219e5f649c9bba0e2d970ce8309e2cb
font_02_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 15924 bytes
SHA-256: 800d7b1dfa1965c33bae67ae9dc6ff01d4d47e6d634f9ee2fdfa3d46bca99fa8