Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efb68627f753d45…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d21de8ad176cf569f4ec06beb7cf2c0a SHA-1: 587604808ace9016dd34e758a838f34518fb7d87 SHA-256: 0efb68627f753d45840a128b8ca68031aa4da63dc2e01f991f15673510e5da6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=running+android+on+ipad PDF link annotation
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/gakulokukon.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pasujezavogimerod.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3e34c9509f96a71f6a1e319a8a5ca2/tarone.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/bomojedufurajidudeneve.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/nozediputuzezixipozix.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/duvubovalukowolif.pdfIn PDF document text
    • http://foodchemsino.com/d/files/dejafimewedodeliguw.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/79521407526.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/92274362647.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143890bb7309---77070189714.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/28444515065.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/72756509475.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/90501356351.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b00ce850c---sevalijitezunelirazi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210921081703.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/40001281538.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/ligugusulefodipubewuk.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/24218274768.pdfIn PDF document text
    • https://eurotig.ro/file/xuvufezoradavufujo.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26353916731.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/75786282275.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/jijema.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/nedatapeno.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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10268 bytes
SHA-256: dfbc392744e59eca75e5076c6f288f658c8bfc08a466e32027e9410edb70c5e8
font_01_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 18772 bytes
SHA-256: e09207cc8cb73e4dfc5350d6a6e7d2f31c9529dcfc8190a902da786c625369d3
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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