Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e550f7935c2212…

MALICIOUS

PDF

87.1 KB Created: 2021-09-11 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f6446e6f2c47f5c10768b6c47c9302b SHA-1: a71b8fdb0157d3e02bd6a2e85c57e462c702d69a SHA-256: c1e550f7935c221252a1e6a976ad86de7290fd9671c1c4d614092f7a8f7e8577
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, some of which point to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yds-wcv.jp/free_images/files/bifixemukudelex.pdf In PDF document text
    • http://annabarons.lv/files/files/4791222690.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lodaz.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2b05418a15b756491ddc73640ffe715a/tiwiluniwesepotilovakem.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kisubufajakokufu.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xamitinid.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdfIn PDF document text
    • http://sns.hu/_user/file/xotusewakolonenopum.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/mamevinetuz.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/kedesa.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46401113582.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137741b834d8---83948093077.pdfIn PDF document text
    • http://capital96.com/userfiles/file/dosobinuko.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/14455013884.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/munazusozikavirunufoza.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/2548587360.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/leronibusidej.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/wibukoritewalolex.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/1206210057.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/56789355612.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/25485854540.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/91534871482.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/jasefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=calculus+early+transcendentals+10th+edition+solution+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 17972 bytes
SHA-256: 927feb3208e951d4d4637eff6dca88b0804620cb6bf1dfee02c148ee29a53db6
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 11056 bytes
SHA-256: 9cfb6fa45d55f4291175d3e59a5519942f0e8bed30ca62ddda30e8b6b11e1393
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16388 bytes
SHA-256: e8dcb5e5fbbc942b73626904f94c1dab99f4a70f0902c6d5c0e18a1168e25d72
font_03_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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