Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fde621c5e382aac…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 01:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24ced24dd5c59f12744e3c0d04c0d6d2 SHA-1: 4af824f89417c832cd2df3206fd4d78c84e8af32 SHA-256: 5fde621c5e382aaccb31940e37ace6e4e950da1ab4a19a3df1bd913e16e3d269
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ebooksweb.net/files/file/boroniza.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba4849f5f---84512283015.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109052258094564.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/63343707867.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/midawimimubid.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/63269845c1580c42faa3f7f1f03a91b3/wexaweti.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/93932041020.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e1qo0ek6gmn7febcjo4adhm5l0/71533599018.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/18446082109.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/edot1jq5cvj1uhps2sv3k8ttqg/kexumelixudidiveku.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/43412615652.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335d41d20c7---dufidefoputewafemu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/48290516557.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vuzupilofumilebirunewefa.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/92435330156.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/98017153795.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/75665088569.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/fejirozanu.pdfIn PDF document text
    • http://njchemland.com/upload/files/53754594553.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xirukazexirulawi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903011840.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/77329724780.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xadogipexigesuzasazojedo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cea1d17---16749359621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fortnite+building+simulator+1v1PDF 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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 17252 bytes
SHA-256: c66131448a13edab7ed1ac7a7b8315c9421ea19d2a22f9729e6d1aa87178713d
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10924 bytes
SHA-256: 7ea1c97123b22a63a545304be1aae1153f486dea8df850df255eb0aac6dde136
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1