Malicious PDF — malware analysis report

Static analysis result for SHA-256 d827e56a8db94c29…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bc418d25529c914663712c0f2294fa1 SHA-1: 698c510b4daa27fa860a0b40c078580726b6dd5a SHA-256: d827e56a8db94c295eb2bd61cff341895374e668808a5d37b3f639e8e9990771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medosojewellery.com/userfiles/files/ziwesujavinetil.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbgi9nd1qikrn37fb1e4ku2h9b/6548282763.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee16af83c8e---gibizeneve.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///58028462792.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/kadidawepulef.pdfIn PDF document text
    • http://ccadl.com/files/20210701013313.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4944f038e---jinatejegokejazoxelamis.pdfIn PDF document text
    • http://artepcb.com/upload/files/lonewezupetabizevenota.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/35552775864.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210524174531_1529220416.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ximewukemuzivubegakijor.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6cb060f8---luvevabuluwej.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/nofimebipo.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/kofawurusiwazuzovi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160704836adda7---nopekabuxizuguna.pdfIn PDF document text
    • https://penzion-palice.cz/content/5651258090.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3bef85c7547f90270d0ea752416231d/28215399792.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabbe2b124---34258501190.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/piwederafujipabisejina.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc70f27b4---darananefu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/5613960580.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/26268808685.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/jamaromosoko.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/kuxefuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+coragem+para+liderar+brene+brown+pdfPDF 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 10904 bytes
SHA-256: 5e27460146cd080a7705aa705d7f1a768574687dc937c43d38cca9dca6c9e0dd
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 18628 bytes
SHA-256: d2c4db39774df536be96125159821ae7a9b7330ec97c7d03c658193ef152269b
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1