Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf79209bf24eb28…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 18:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cc376055d78d3f48ced812e702e9c85 SHA-1: c1c23f573981faf0e6f7a7abd46681adcb082209 SHA-256: eaf79209bf24eb288697518b7c817c92efa96cd8071a169458f04eec4d4a7f9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, indicating a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af43355c03---21521194899.pdf In PDF document text
    • https://adesso-moosburg.de/images/file/46992275038.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7b57phfjb6umujjloaaatp7n2c/gedejowabewuxuxogiwi.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210910070538548901367.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/xudajogopexivulat.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/64818968653.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/bawenujiluludomuxumaje.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/goneba.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/muveluwomebejojizogi.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/jevenisorurejasa.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/labebovibunabisufebujisip.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/pipowefemodipoteke.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9a2914f0---lotidul.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/busabilajipokekuzonif.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/lopopakivameverunozigi.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109051734267439.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/nogexonepuve.pdfIn PDF document text
    • http://gtshotel.it/images/file/ruwalotupuv.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/11194118771.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/81871240325.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/kazidadupog.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jibanu.pdfIn PDF document text
    • https://tigapilar.com/upload/files/12289891568.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/16038312492.pdfIn PDF document text
    • http://hangquangauto.com/files/74575215302.pdfIn PDF document text
    • http://alltechsro.cz/files/76901110127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=can+i+update+android+versionPDF 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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 18156 bytes
SHA-256: 56809350dcacd9fd5221cc53ec19fff4226b65c397aa1366013a93ea3c586fbb
font_01_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10536 bytes
SHA-256: 24c24323ae92a4dcfc864c0dab348430c41fb2ee9a6395fa7f58309bcf1c306e
font_02_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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