Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2392e572008eb…

MALICIOUS

PDF

83.4 KB Created: 2021-07-13 06:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 014c9f35bbc0241ee7323505a88a098b SHA-1: e8b5b223f7e77b8e83b2a8e573e43e1485e1df4e SHA-256: 70b2392e572008eb9db86c627ef479019a58f88ba1e4db29b776f9e89a0e4bd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://havanic.com/cache/fck_files/file/58174356007.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5e81a07f2aeb4c91a5ffca85e017b2e1/dapaxuzogagoratuj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4fd9e36409bf84798f585b531c226e69/64167904351.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jevuf.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a148ad165---wiwejenerokunom.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/27280968776.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28fb127b8---xudenomaxor.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093df2f7efcb---52617810569.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9993a4157---16343734357.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7705040bcc---motidovipovorevuxezunoni.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cd62ebfe---78156271431.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/42333879951.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13617270627.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084069bf2986---misutakudezoxate.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/43115388773.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kg0q4lj0mu0lr54rpkvmj4g1iv/56358000055.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af93acc9b0c---61293883889.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/64292050213.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b4b5453c7e862046119e7004a995945b/48257424557.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7hdcp7lo5fpe7uma5luao1181n/6812542371.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/38743883155.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/18096181735.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/juzonuxatajategijuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=male+s+namesPDF 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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 9852 bytes
SHA-256: 0440f337444739fede0d60e49f11bd8a71bb33e5c29ee5559bca6e8e7ab04695
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 17096 bytes
SHA-256: 35c7893aa47d41f0c7a10bd94129a2badf19c90183ea12b4978cd5589d916f5c