Malicious PDF — malware analysis report

Static analysis result for SHA-256 711706eda8c5de87…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 14:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6662e7971a4930e610b349ac598b9b66 SHA-1: 2c852e047e8de00eeec73571606795853c59e7f4 SHA-256: 711706eda8c5de8779f6e4628dca66e98cc9ec56ba1d637d3a1a6669a065d97f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=transporte+de+sustancias+activo+y+pasivo+pdf PDF link annotation
    • http://akinmedikal.com/uploads/file/44457561794.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607050560a405---xabasoxojaxef.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/jifutim.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b62db490b55---detirogeputafabere.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/81525257409.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dikofikasudipakebeli.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970ae9c22c6---43808248507.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/79660975221.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rulobupu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/gotiber.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/sefabe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/mumegixazewotebura.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0e66321604c4764181f0c6fa4603a337/tagijurakumafir.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/jepuzig.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/64551780653.pdfIn PDF document text
    • http://air-con.ru/upload/files/kikesupefewodetizeperi.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/2109079267.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ae3d9e7fd13a6c439c2bd7e7a46bc7a9/29784912380.pdfIn PDF document text
    • http://vanhacollection.com/images/files/watesekanonodej.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/7864775971.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/94103974398.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/52800114526513a02148b7ec19486ceb/limulobopanakiwalog.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078c75c4daa6---51060419639.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/sikokefurifo.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/timipelir.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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 10812 bytes
SHA-256: f810c566607bbf322ae940542568e4b5f6b27d1c544cffe5b26112abb1d2ad22
font_02_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 15264 bytes
SHA-256: 707e612ecfd67bb5ee3f402b2a3b2d63f6d3b4c9eb4fbb3755866b588e63282a

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