Malicious PDF — malware analysis report

Static analysis result for SHA-256 584db4123c247c4a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 15:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de9dd5672df6086094bd458d823ee58a SHA-1: cda11d22adbf1f6d298a782c93214e75e1e52ce7 SHA-256: 584db4123c247c4a11e2d9aff1f6a2234cae7a481cc68ddacac01845710762b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robert-zauer.cz/userfiles/file/taxexo.pdf In PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/88077508215.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613641610285a---64680146798.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/rusapo.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/70375939403.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zudodi.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/44130857443.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/pitokupovusapupoxim.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9dqa2oged60fjjkg3f5j5i0e38/28208623887.pdfIn PDF document text
    • http://bociany.sk/media/file/66092296395.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/32240421117.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/bagowofubu.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/labotudaxuzejijiwenataj.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/190607474596.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd493b669---80456556429.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c67e198f3---fenejolepumakarijejezulo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/wilojironobixesefokuvel.pdfIn PDF document text
    • https://kimcert.com/E/file/wifeku.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/42164588384.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f1cce7451a57e0bc7fc3db1c79f8bc9f/xinonavivakojaloxesipor.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/80398375951.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/7501664286.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/lenemaxupumesad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+nuzlocke+gba+romPDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 21944 bytes
SHA-256: 770fd55ce14835384f0282180de961981e8d9e80f135985bd31f4a3cbb5b3da3
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 10608 bytes
SHA-256: 2b5b4f32144dbe7e754106a9d2a35d0b8959f4eb8cfc5ab6a43c3ed90dcede76

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