Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51e5a46d89bceef…

MALICIOUS

PDF

283.6 KB Created: 2021-05-26 03:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b449ca82f7307006cad36a474b66fffc SHA-1: f32be8970398782c48829571033b768aeb59fb68 SHA-256: a51e5a46d89bceefc1ae61559ac87e94f2431c0478cc61c6835758e36d9e5afe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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=sociologia+pdf+macionis PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/97abbb2837e1f9822625dd22a3e76248/93064154673.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c953ec384c---8257687635.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/m950s11ro4qfaal19tpdp6nso5/99881068132.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/sarako.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/aae5c8392d80423f1f906f07bd78754e/45075455013.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7580472ee---33656984856.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ded4542c---gazumireraripuwelakawef.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160837f0025384---joledubemanasoroniditajuv.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/99881596948.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fe487194---86799542680.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee5f96faf---tazebunozorexajamezute.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68473465672.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kolusitepozakufabovap.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lavimufuweboduwij.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/9197109753.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f3e9dc536f7348df2639e0af3646cd79/69605633118.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/7288024307.pdfIn PDF document text
    • http:///www.amnesty.org/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41E47 5480 bytes
SHA-256: aba7c9fa2b909f6bd4f5e2ab0c62e27c6541d0abc38b56e7b9d567f969c6e79a
font_01_sfnt_off000430e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x430E5 14500 bytes
SHA-256: 6424142a5c38637f5d159e5a2289a6dc5f4ed286f09585f2a25d061e07f2523a

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