Malicious PDF — malware analysis report

Static analysis result for SHA-256 5311b54655d3f04d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 13:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98c6ab916162338b23e484db77014e7b SHA-1: 122bbab07f33e7741421fa5fd06f25a6cbde0f0d SHA-256: 5311b54655d3f04d805bafc646f3311e0e04f104db9b8013a075f1f65d8dbb0c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to host and distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 http://www.azurwelcomeservices.com/userfiles/file/xokejujegef.pdf In PDF document text
    • http://barcabianca.eu/upload/file/dojopenagisanonof.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ac7fc5046afa95839b9ca6e20d2422cb/40794578092.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/ruzugedolidot.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/900840549.pdfIn PDF document text
    • http://seritour.com/rsm/files/gibabafugivofofexi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/43214473086.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kigizufikupepimima.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/19226359073.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/56269015253.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/dbb2449d1bca7570df604d77bf9d319e/94141798773.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e605e2c32---44770161868.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/lirupikowigal.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lavarodejavamip.pdfIn PDF document text
    • http://cosyromania.com/media/file/95751917542.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161323a6b949b2---kanixagovu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab2e98904---detidofivadazadebatu.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/tasalanejuxovopapifis.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f312b4ec2---9458481236.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/tafigoworafigorowagetom.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xusun.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30c7f771187b315f620f738d8fb69833/razekojijusuj.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/jozagi.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/91811214524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=call+recording+my+phonePDF 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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10840 bytes
SHA-256: 19d4f403673c533845bec69ccf6634a85b9e0600edcd1ac444bf48ff15921c9f
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 17844 bytes
SHA-256: 74f2da4ff66f62162faa530176b166cae1022404fce8eb4e5ef1dd60f2d17483

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