Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff8da233462afe2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 13:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9087ce96b4007e69ecb9d001d19bbd32 SHA-1: e0ddd3d7bcaa6412d41d3d8cb193a834c11bade6 SHA-256: 7ff8da233462afe23159444373e92dd4210eeff4a24a6e6eafa81e2aa01ac8dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous domains, some of which appear to be compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nolimitscenter.be/peausitive/images/FCKeditor/file/gomitevuwomejuxilafot.pdf In PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://wooshin.kr/uploaded/file/346221858614b981adae14.pdfIn PDF document text
    • http://kahasat.cz/data/file/xerarovolaruk.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///rasopapukoluj.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/27b591e38736fe9567f690ccc26ebf4c/41931074739.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/jotorozeworomipubojadesaj.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/pasafidusok.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/acpo7008hui1slfcse2e7fec16/23792526171.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/48401727848.pdfIn PDF document text
    • http://weldingplaza.com/files/file/87673769075.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135b50a19d41---60508344830.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/68268143162.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161338c1a6c585---77819916613.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/74662093133.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/jununamawurir.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/retibejejuli.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/78046335913.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/fakafaweme.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/46517233678.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f59e7130c9baec99d3a03f8fb09d6d8e/28633573966.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ej5aeqe1hac4tp552kl696ev7b/lulimerinafepajipudifali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+reels+linkPDF 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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 17800 bytes
SHA-256: 401c86ebc4a8b68fa926a8e1d149083845e26d4dad8216d6b238afe130d72b55
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10324 bytes
SHA-256: 8d8a3a9bc46a1bd7cece7cc91cc273cb8ecfbf8ec3efcd3c6eeec2ae92c848e9

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