Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19560f56119bf06…

MALICIOUS

PDF

88.8 KB Created: 2021-08-25 19:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd0467873df083184be86e80dce3e37d SHA-1: dd6c973eeca398ee2775cb1cb2324a1c37311694 SHA-256: f19560f56119bf06e202010f668286af1360a716c37b24a5a98b7c940b9f0ea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning attempt. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/20163866018.pdf In PDF document text
    • http://vandientuchinhhang.com/upload/files/xejapunogipelokofuzeres.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/93673529021.pdfIn PDF document text
    • http://lblussana.it/images/file/puzevikagijemexefolas.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940f4ceb3c5---rasarolikobeb.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debisonodokoto.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5826698abe94d1c0191c867d72b9b93c/movovasifezisajuzatikito.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210824_8F7A4CFF4E8CBCE8.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22470932738.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lineragedojojibanep.pdfIn PDF document text
    • http://mosjob.ru/images/file/mopevumunipapijif.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/7964791084.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/43f70a4e2ea95b682043e0fa3a1547e3/27466567201.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050916540271182.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6edd3b02fdaa08c7c310bf583ae53be4/94077400123.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/gemimokexod.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611750c27cbb9---zusamisojufi.pdfIn PDF document text
    • http://erdbau-rauch.at/76850122530.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/13650805460.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nejeg.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1df7f2c4f---jopazijiwodirad.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/pesivizo.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/jegunadevazidobimo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f0e514be690eb65854f70f9e73fdb90/xufaneze.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/036210a0adc652fe30358896cd43ef6f/11932081628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=plane+polarized+light+vibrate+in+directionPDF 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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 19228 bytes
SHA-256: 337257e5d6d0abeb926c7b3d101c6cdc3ba74f6db07984cf989be489a7e8e821
font_01_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 10892 bytes
SHA-256: 114ac3d410b0a426154a5da609cfd7ebfedc53bd5de225ba516816af1847963c
font_02_sfnt_off00013c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1