Malicious PDF — malware analysis report

Static analysis result for SHA-256 912eb4b2508ddc9c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 13:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b4eb41004b9341d954b96b0fa5fbfc2 SHA-1: 6e9f7df18cead1af298257fa39ce606e51b581fd SHA-256: 912eb4b2508ddc9c6f8b71634d5e032ae44b81cbcaba84d5da22f759f8d58bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests the document is designed to lure users to potentially malicious websites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=comparative+and+superlative+adjectives+exercises+pdf PDF link annotation
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/wusuteporadeponaj.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/70378441521.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fojak.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/87900697967.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/19654687655.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/dezitexuxidikelovobip.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/2893963623.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/31a34cad1ae387b8dab30210e45c085f/devuzavagebunuwubenu.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/34705194747.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/favotebigakozolot.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/381436841.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/39923664301.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/lixusemo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/litatejodazikosevajudel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e41043f1e---buzamoxavojoda.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/wuxijoxil.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xoxirefol.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/taxipadojosefon.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/ruxatuzarizibasekuf.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/xivetagudobakavuginiviza.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/11589826936.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/031bef953be512ae4d79740ec9d6ebc0/wolorilenidokam.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd16a7c83f---63958063793.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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 18704 bytes
SHA-256: 7137e4ce7133beb6568cc4f500c68450039dcd49d13ad109efa732ac353df785
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 11208 bytes
SHA-256: 9936301891c8c23c0f9e21a582951d36a48beea223720102f590c0ad396fa527

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