Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1dc9105c8f2a92…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 01:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c510313a24e434a47a62085e83eb404 SHA-1: 36c0d9f836d5f715f90e89c67af518ce63480610 SHA-256: 9d1dc9105c8f2a9203285b572fd35ffbcf399a814c102c885afe0bdbca6d214b
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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://synerhu.ru/uplcv?utm_term=advan+vandroid+s4 PDF link annotation
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/kugem.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/915dfe2c968b3f94b0f992257cb9b1f8/98385101106.pdfIn PDF document text
    • http://jfe.hk/userfiles/xorakibepibotebelijaxolab.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/36429014892.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vabolowuz.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210915_162630.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/koxuxaxebedilimamonuf.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mopefe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614077ebf3b47---69384182206.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/65894943444.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213f229b8f---tagisimuripa.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/83117530321.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ece5bed2fcff2bb39276be7874faeeec/dexijuzososug.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/7543919008.pdfIn PDF document text
    • http://silver1979.com/upload/file/48575732260.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/pudutegirinugimi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149088c94890---jivikunabimufigodox.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87214661864.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/26996630640.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/19364711657.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/faverosuvafo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/3833904082.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/17996265719.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10092 bytes
SHA-256: d9d8e1da6d8cac01ae8eb5aa8c394bd1c3e714d2956e9e66259e3aa2fc4f44e4
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 17616 bytes
SHA-256: c67b1b9db00abb13e31900a291dce5b5ea91dc3e0c5bdae7c3b48baa86597662

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