Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e82a340b0193873…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d04a73b51342680b13283998150badc6 SHA-1: f7be819405e0bfeceb44c4a52f75effb7d671631 SHA-256: 5e82a340b019387399bd21fa53ab06937d39a909f351f13710a0ba51c6a81a62
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly supports the malicious verdict, suggesting the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tjpapigroup3.com/contents//files/95116688748.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/verinulemojev.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d98ae76eec947c4308897fa8da8d4d/fudidapuvekokezesegesi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071663175aed---mexis.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0b944b2590419cbc050c97e3fefee501/86650394147.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/39929426686.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/39035667137.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90daea1c3b---dekogil.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4702f0f810---4036153473.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/lesizuwonitisagabodaw.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/sawaletado.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871402b374c---foxekavuwew.pdfIn PDF document text
    • https://mszukam.pl/dat//file/koviz.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/77274345749.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pivowevasinog.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/jinusaseredatiloravu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/kojufamelixogebuwi.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/89534460375.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i3pj230o91s238d58rlievbn1p/zofogezud.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/13661965208.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tijozusazabem.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/gikegifutad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cours+electrocardiogramme+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ee94c88c---69183559611.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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10992 bytes
SHA-256: 179f6ae8cf977fad5267f601c7f817c0f2a5f0175015fc812139a65efb97d7c2
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 18972 bytes
SHA-256: a1eadd4eacee199691124602136ff9cabfc4964722ce010c446f3e53cd7eab81