Malicious PDF — malware analysis report

Static analysis result for SHA-256 df425918b7d2d7c6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 15:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86630353d46baaae8789e58535da4566 SHA-1: 2cb40efa3e348cb9dbc3d1320e0730c1d68b2780 SHA-256: df425918b7d2d7c64af1c5c38f036e942a7568cce6d1a7ef1ccb6e86d9057f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the sample identified as a phishing trojan. The primary attack pattern involves luring users to external sites that likely serve further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://zae.me/datafiles/file/96417334021.pdf In PDF document text
    • http://summithighschool1958.com/clients/71652/File/40999490676.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a96db62bd9dde901a73ec9ae0962c869/47323940801.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc68bd278b---rupuxeganenawe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2959472a---ruzedeluvubezunobu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bowejamiluxikemofolufo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/72736796478.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/61396633321.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c6f10aa4460257d7e1f1e429dc8db588/25374520195.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/tuxugelal.pdfIn PDF document text
    • http://huntland.hu/upload/file/80594528402.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210819_2BCDE17FB81C600C.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/29578f6c867da6920bae44cc8887a3d3/31986597101.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/pamunego.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/4485284214.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/28359217564.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8dd485a9---28896516673.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98d798a50---gapopo.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/49771711211.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20bf6ef5f---66708092976.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/03f4cb0016f9625dbbdf678ff12309ed/fowenoni.pdfIn PDF document text
    • http://newo.ru/files/files/84089696870.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/dujejodovazotusafoxolorev.pdfIn PDF document text
    • http://aa-nusd.jp/21283554898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fistula+anales+pdfPDF 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10348 bytes
SHA-256: 517b4db37e2d871754f4a0da59a9d6d840e6965ec8412dbf96cf7a5b8c410edc
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 17140 bytes
SHA-256: b6675d6ffbeef42aa6a2f312c098d403be84b696e9d09cc338cf80c5eef862ef

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