Malicious PDF — malware analysis report

Static analysis result for SHA-256 b761e359eb5cb39f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 17:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61b0f6e982fd59b682acc6e66a2387bb SHA-1: 84da42ee791ca878d0ac4a36648befa660599d0f SHA-256: b761e359eb5cb39fbcd6265751de690112d9542491ed13528449bd1266f8e17e
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 upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nstoplana.rs/ckfinder/userfiles/files/pomofonigekuwe.pdf In PDF document text
    • http://rockefellersgold.hu/editor_up/58181574054.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xixelawabapotopovaxelib.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/fb6b9a9f04c1170fb69cc5f7ad111652/nirogelunutoxadax.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/bezawanufabonelapedumez.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/derilosusanon.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/90a4f2b8f116b7017a51aa5786a61e2d/finibojerox.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gupanixedivafepabufo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/924288783.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b030537fe87966c27efb3e40e4a289d1/batokepalurazale.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rolalozusew.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fc119a40ddb9f1a1051d4ed083febd31/gaxanikizovetolase.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/nunamorejofazavafubovulat.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/12316850122.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/pukepe.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/68661391492.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa46880228---77767145008.pdfIn PDF document text
    • https://schmitz.cz/res/file/37342929882.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/68624910108.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/rizabosuwibobipoxeluz.pdfIn PDF document text
    • https://mediaskills.rs/files/zataropemu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/rokusijebedifoda.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/masuzexoxixedudopavi.pdfIn PDF document text
    • https://fong-cai.com/upload/files/pikes.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a07ebe60b---36488300511.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lowix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+reading+book+pdf+downloadPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10940 bytes
SHA-256: 6b5a5121a98b97dcfc9dd5607e024317b21b939cf9db478fa13f4eec0c9345ca
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 17480 bytes
SHA-256: 49c964a1a8af632219b6347fdd2cea230af357bb438fdef4a6e60c8f5f557fb2
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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