Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fac66d108a5dba0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 22:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9ddba4a27a314536a07dc2bea8cbb6f4 SHA-1: 6bd812219f22044a9203b4aefaedfec3130f4754 SHA-256: 7fac66d108a5dba025ef65199ee248838237cc6db291382b8998db04b1dbb1df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. Furthermore, it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites, increasing the risk of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2a893952a11f2ecd975d1837798ab82c/41060854187.pdf In PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/40903639716.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/fupabexi.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/puvegena.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/27970132025.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wigikuwifemamevovipagub.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/fokebigisuvevudidufufefi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/76174854940.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/ruxevasalagaxeluvot.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/gesutamopukon.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/304705810adb284405205d187a657509/lewirofewodowapamokewu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/58947512861.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/4906485309.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/20473638699.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c786e7fe95b3f855daaead580a24dcda/34587518338.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/94998583760.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fakave.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_0D190F21826686BE.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/41767986915.pdfIn PDF document text
    • http://napiarsaigh.com/images/voralin.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210914083825.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d88fd36---69140244995.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tetuganavirazakegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+burnout+dominator+ppssppPDF 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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 10748 bytes
SHA-256: 79221ab6376e272dc938a84e12cd7dc2b6b1749c5515571090d3ccc99083da39
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 17416 bytes
SHA-256: 11a1fb3b6b99fa80d81e4049d1faa4d36c2734024a16e8c55dab8c1678349644

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