Malicious PDF — malware analysis report

Static analysis result for SHA-256 0824a9bf0823d007…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 16:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4cde802b41116d2cbcad9b8a3ef659f SHA-1: 41afe1bb6f97558101fd1e6f2935cd7a4eed465d SHA-256: 0824a9bf0823d007de158656b71401f643c8886c26a30fc049a0f00cc012fda4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload storage, designed to redirect users to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341cf20fa53---xalivuxovi.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/navudopuguzobemuv.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/putikevarexofiregomi.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/bovezijefilamara.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ravobevugovodid.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/juvugokazesexaj.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/78232513586.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67586d4af56974d7277754935e7a3fa9/15747166875.pdfIn PDF document text
    • http://prograsifkalip.com/files/81020617902.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/78480841251.pdfIn PDF document text
    • http://4bx.pl/public/file/novibefuxobipox.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/wemapusejipatavibexe.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/554382061.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/manuberaroxovegipurejosop.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/bibafopolerutasetowitilov.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210916051420.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/28833637139.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/19732133852.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/21487226999.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/sejel.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e5d4368088322c412a9ee0920d76b280/kidizijuduxoruzamix.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/pobog.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/70081928983.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutunuxuzebebez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+hackbot+hacking+gamePDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 17740 bytes
SHA-256: f4b26588512177021f800d516abedd8a652d01e01756bec16a77bf6b511cb701
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10868 bytes
SHA-256: 3c50010ed454d5ea20e0608dc4630e04b1a76b155618d48fd35f1ba3c9f50d8d
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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