Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b253c05f81f32ba…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ebc53fc0a856113a52116f66e03c17c0 SHA-1: ad4dd8beaf6b16531eedb2d20ec4386196443f0c SHA-256: 9b253c05f81f32ba50ec4104c80bef2400cb23443a5fba7eb55ccb97125d73a6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dbe39dae16df3835a42e10074e70f397/11265331585.pdf In PDF document text
    • http://joeun-it.com/userData/board/file/84556696840.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jibimomosutel.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/texajajeriduzawukinadigol.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/welufazaxanul.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/99036998344.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/femepozanofuvi.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/99920587260.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vabara.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/zapebodiwuwebotulemepo.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/kuvaxoxu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161495838bfa29---wotigulufaterolajap.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/25243433359.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/bazaka.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/42956420516.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/pakugomavekojajef.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/vexumotalipari.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wuredakedodivefemiv.pdfIn PDF document text
    • http://koutingchina.com/upload/files/pabegugozaz.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/97657633475.pdfIn PDF document text
    • http://playworkspartnership.ca/sites/default/files/file/benemifufag.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/966c3f5ca9f99754d50a917af40c1aee/ketaboluvogowobe.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/refuvub.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/3884375381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+sa+ultra+graphics+mod+for+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_off0000b218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB218 11072 bytes
SHA-256: 1100c19499aa07756a3162ffc55d0f9266a2f92114b50d79b1ae4e2639ba6ce8
font_01_sfnt_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 15208 bytes
SHA-256: 6d6390a77b5af0e918761f55f1a1ef48d2ebc765e7700229fe254dd1d679f75e