Malicious PDF — malware analysis report

Static analysis result for SHA-256 de98598505e39b88…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 19:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c6275ddddcd17065a585d233025c349 SHA-1: c8a29a148fedee6b0c3adf5bfc50e395e305c482 SHA-256: de98598505e39b88a4a999b57a2878505e5c839929e14a7285f6cb8928ce4e5d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the embedded URLs and heuristic findings point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c73a736e8523ae0bf176971f1ea38caa/wukaziweledokizosoto.pdf In PDF document text
    • http://edmo-cars.nl/images/file/zobujekagaruda.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/juvejisiwawuxiwitabur.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/16870639535.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371f095e1c6---31548118018.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/46449338991.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/71527621619.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61373fcf418ed.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/giwuxuv.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/15139873435.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/puwutivenufeguforepaxemag.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/88894819328.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9172a72f7---50777963031.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/22779953832.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082b569443---46644847398.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/tusedexuvu.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/limubafisemiwifexug.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140913c373ef---68209965443.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/77484769941.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mudewosuratepasikedesaru.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/8771819381.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11966439887.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/71688820976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=create+database+in+sqlite+androidPDF 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_off0000c580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 17896 bytes
SHA-256: 5ab60243cffefd290c7c63fe86bbeb1f61089bb436dc5032faa34c3ec9c7a586
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 10556 bytes
SHA-256: 403524feb693b2d0a8e500d5d5d07c1df1b0a97e38943d8675b3a270b279c767

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