Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b15a7be4ab0698e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 22:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a090f57a0bd3af64cdd8ed6ae3e7e437 SHA-1: aa2598228d3ceba9469b43b38aaef3a20b2c1e78 SHA-256: 5b15a7be4ab0698effe8fd9d1e02405dc325e1b1c4b8fff97fc237bee5fe327b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to potentially compromised CMS upload directories. The presence of numerous links on disposable hosting further supports a malicious purpose, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://matsonconstruction.net/userfiles/file/duzinema.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612be91e34ae4---78663217899.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/jipedefimevukebole.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03fe0a3dd---dewufavop.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/zexatojafepuzulafuzo.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/92396382238.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/54823467925.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gupezupidojivarepazaxow.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/gezozoxixuzu.pdfIn PDF document text
    • https://ptogel1.com/contents/files/kasisijasij.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sulagamozikuwulunuduz.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/2974239825.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/89901744371.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f802b23835fa8ce4e5e4abd500df5954/89941605977.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/bomokavosatotewora.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tifemakuwodikejam.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc77c96bcb9c6bb83b5321b07d4bb/6682969105.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/aseli8vd7n91gpa4igqdtc6b62/58358921133.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5aefacd4f797ace99f61bbbf644364a8/nijimiposozokexigubepubew.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a24b769ab---24185067738.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/47011833781.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/mubesitifesebote.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/nupefatepiladedafagevikeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vivitar+reflector+telescope+manualPDF 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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10776 bytes
SHA-256: cd3bda989cc84399f4e1627747d828d31f0cff5c30388cf91749365d74c5e0de
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 20284 bytes
SHA-256: c38132233290d25064825688571a2dd6c869c651c15cdf0d9f3ea03caf1d2b7e
font_02_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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