Malicious PDF — malware analysis report

Static analysis result for SHA-256 24884ea5d02b2311…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 19:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8375175f8d133429d2b6f85b41affa7f SHA-1: 633462025f9008a5cd716546efd956f56e83bd31 SHA-256: 24884ea5d02b23111597874de85623207c4470d4345374c733a77c3f4bd039fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://infrive.ru/uplcv?utm_term=andamentos+musicais+pdf PDF link annotation
    • http://ttlh.vn/storage/ckfinder/files/5941377787.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160797bc72982d---52429847034.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/24733149915.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502173156214408.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/69008949515.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/rizawagedov.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/wavemipafeperitisupituben.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/67583297280.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefunirejuto.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/5012388595.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/xubigaweme.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab4c7a548---fofufena.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/58970379553.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f96099df---lufebigitipuzezuniba.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085581a8ad5e---rafirejilu.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wivibasenesefeniludupidel.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/16360336830.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/551d20afff77dc8facc333aeba765903/ziseji.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/14616699049.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/31450251790.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vipiweloxasabe.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/95494639390.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/95816678357.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1691a717---28721067475.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/36548387590.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10716 bytes
SHA-256: 60438d98cb8b79710cf94c20aba87dccceff0b40d226099b5c92c9b8ee3557b2
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 19376 bytes
SHA-256: cdf6c72b63d4df13442706d335f059904a6c8554d27f31ea9e6eda10b24dbc53
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7B 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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