Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5b8b6774fe399a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 09:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1235ba3c0ce34ae67ae59f48cc6ed2a SHA-1: 7296ab0fd817694fe20c702be8d1158e27e83f02 SHA-256: 4e5b8b6774fe399a0c2809f4c250c3ff042aabba3652d20e99b34b59e1a6324d
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point to a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=convert+pdf+to+pages+on+mac PDF link annotation
    • https://rrr71.ru/upload_picture/wegimanu.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/sivuwapi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc93e255d---28135601903.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/mawobigenewapi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/86927ce4b289d53b0e8ccfc8c5dbbf7f/tolif.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/40941512139.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/73539954189.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e930a7d6---bifemetodelezege.pdfIn PDF document text
    • http://meta-min.com/files/19042173503.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5j93e2b55osj3kassgh7slliva/firatixigazoxosi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/20595522167.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/wokibudizetidipanunor.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030080c6808---wolifalazaxejirem.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/71892842326.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/pizafekasija.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8bf6e5d0e---46520288120.pdfIn PDF document text
    • https://tavio.ru/files/file/51586909308.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3g3f7lapa36501h6gor853t532/28731210185.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/86824758007.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160835ea6461ce---10189417157.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/52474471936.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0c06d9a2a5e94cb011a49cca6a8c008/62528946838.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161173d0a4805b---10870271272.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/84dd487a944428bc5400c700be3a9174/zodovorezanetegotixovas.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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10920 bytes
SHA-256: 4c36a5bc838fe3cce2f306d7581edfab4320a5781af956aa55d0965f943b5d4d
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 18408 bytes
SHA-256: 697dc2e8c32b9880782007f4e302ae9109d3562f2fc229ff76996a2b1df441ed

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