Malicious PDF — malware analysis report

Static analysis result for SHA-256 6763d7c9ec72b235…

MALICIOUS

PDF

76.3 KB Created: 2021-09-25 05:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d64b925eb529fbc6144d067b63d30da SHA-1: f116ea539ad3a1d250a43a155aeb99bb48c27e25 SHA-256: 6763d7c9ec72b23598674fc0456857384d03249eabb02fbe9a31e03dc234a291
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of multiple PDF URIs pointing to potentially compromised or disposable hosting sites suggests an attempt to distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://autopsrus.com/ckfinder/userfiles/files/lopekaxokamamenuvakazoxo.pdf In PDF document text
    • https://mimpishio2bet.net/contents/files/vejotodekuwufeserow.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/25596026191.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zopuzojipovujanerosin.pdfIn PDF document text
    • http://119pump.net/d/files/dajuvatofetonufumen.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mevibijimitamaxomamedix.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/zopozadusafugasipixi.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/56448556848.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/vokaxexewifub.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fee7a3bfc---lozalit.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/22970622222.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/66481154281.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/ralujulujajelaf.pdfPDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fad9a5305fbe1c023bef52c2d1f0933/68243943502.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/jotenomawajopokedetaz.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c1906bc655a6128b58adbbaab4f5f594/kivadopaligigejas.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb51ee8aca---widetatap.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/vewelakur.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/62327773158.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/74759129759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=side+loader+apkPDF 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_off0000c1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F8 19504 bytes
SHA-256: 003e2cbc64efb2ca5b84489bffbc37a8fdab03fbf7a6130786e9d34ec5dbc51e
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10184 bytes
SHA-256: c6502caf9922dbf612c26e840259969f66ddc621ab85d0cd7f6988889b9c4db5

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