Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d9ecc211a16b34…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 06:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e913a3de4d1138663725e37c0c97252 SHA-1: 6e8ab31f485499636aa9752fe5048092b389fff2 SHA-256: 03d9ecc211a16b341a4c3ced2ff7df27b78d91f97f4bbd6212f70e2ca69d838e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=top+10+design+tools PDF link annotation
    • http://palestraarkadia.it/userfiles/files/85370242276.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/77109107734.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/sigumosenosuru.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kararewa.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907193203.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/37043390984.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135163fb3f15---71931454617.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd3566678---motenezesorawizovifale.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/dalufa.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901202358511531.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/mesino.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/3662115752.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/20872765730.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kawamukuritazodaligejuva.pdfIn PDF document text
    • https://faceless.me/userfiles/files/tevagaket.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/vimowasakubason.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403890dd1ed---49343584111.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/64857907355.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338d3b55eed---58107491453.pdfIn PDF document text
    • http://asfalon.com/__files/file/46142871960.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/nusimepibiwonakigibusavo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/gigamafefako.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/19818623802.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/delibigokopesuvigexu.pdfIn PDF document text
    • https://apelhijau.com/contents/files/25198906998.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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10440 bytes
SHA-256: e42007e0ce89bab06bc42014a0bf4af9a8751024be27eea651107149e199e725
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 17624 bytes
SHA-256: 34cb686a1a8da24ef6c8153c5a0dda200794649d678aa61088717e59fa4dce02

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