Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef6b762eea4e7f…

MALICIOUS

PDF

91.4 KB Created: 2021-09-17 17:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9418ac41f69f3303e7754d8b236ab8a6 SHA-1: d7be715a032225ceafeabd235c55126349d95cf9 SHA-256: d4ef6b762eea4e7f18729fb7b0e362020aa842e082f275374f713059f1b21f53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded URLs, including one with a 'utm_term' parameter suggesting a phishing lure for 'free download', strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=pte+general+books+pdf+free+download PDF link annotation
    • https://www.scmsgroup.org/ckfinder/userfiles/files/77809499282.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/nonemi.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/30974046686.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/gupat.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9a3a9fdf2948c107bde38fd1e1be2803/52728351370.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kifavadafez.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/jeruxubo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8b9f25f5---pidiferurorofemubetepo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kq19co0084pce3a905iiicqsm0/52025362325.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c7dc3b3ac4b7081324cbc7f2aed726f4/81674937930.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/589e82bb14ea72571ef58dedddb82c5d/99886095309.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/kuxerokaxe.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/2920114627.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36961472018.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/miwixifasis.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/85825866683.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/37907160951.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcda391a3---wuratekunubat.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a8ad62a6---22890041982.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/10079266562.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/wekarurodareg.pdfIn PDF document text
    • https://iwistw.com/upload/files/sezekedovo.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/nofesuxalilakaxux.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xuvinopotemudixozonez.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/87725928807.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_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 17392 bytes
SHA-256: e1e7c6602bdf54ad2463278c821e2c13c8caa726cfcd86b64f244fdfee7baf06
font_02_sfnt_off00014669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14669 10900 bytes
SHA-256: e1993e4f7e62a46d8e83d2e0dad8d50c7f24722d330bc1da2c43e16e56228560

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