Malicious PDF — malware analysis report

Static analysis result for SHA-256 4834c813900d7a3a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 15:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 511d7500044ff89c76c583b1e5c04bb4 SHA-1: 55634b4638e29b6886719f5ea99444279ce068b1 SHA-256: 4834c813900d7a3aef05e5af6963f6fea6815b51ff79c96782334784393e5f81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' heuristic. This script likely redirects users to malicious URLs, as evidenced by the numerous external URIs found in the document, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gegeny.hu/uploads/file/77188226612.pdf In PDF document text
    • http://ticketsperiodico.com/galeria/files/55715139649.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/31638563924.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143a38ea4a70---4967416189.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/kopamowerejupavodogata.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_46FC30A6EE8F4A68.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41776442544.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/sinanogokareged.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jupalorufoziwewisoburajek.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34d17f717---43915733060.pdfIn PDF document text
    • https://tonitomov.com/picture/file/59231628993.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/suxajetajarijeseworaxi.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/55889185107.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pisubevotivam.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96e6ec6c7---96325955675.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e6d2cfb3b31fd3501e696910f19d0f28/19677173007.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/386091653.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/14857053722.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613244ced349c---puxexinexodibadorewogigo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/37863351182.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nejogowomizuposaxe.pdfIn PDF document text
    • http://laduses.nl/image/file/82946538764.pdfIn PDF document text
    • https://cubic.is/userfiles/file/76105752892.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/dopixoxupasodudexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+pictures+hidden+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 11000 bytes
SHA-256: 2e3f882cf8dad0ea251062da3bf044752dbc1e521a8ec80d9642f247477b5167
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 17680 bytes
SHA-256: 5cc0f229e87b8890102f3ed1cdb9a92c8874f0acb121c77fb9aa8429fe7be3bd

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