Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c55be091e51ffe7…

MALICIOUS

PDF

97.0 KB Created: 2021-07-08 09:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff8e324c326551558b06501cb6514fbf SHA-1: 29fada6bcf38bce15adb8348cd62f3e73138a97a SHA-256: 2c55be091e51ffe7e9a3ac19dfe2e96fa7de816c6005196dc7f31929297abd21
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate maliciousness. The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://hagepoorter.be/files/files/83101453633.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/57800050806.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/zagusenirowujep.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/239329990ebb36cf5e973b2c65de0810/peginizepozamepape.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/42846339728.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf4e72010---93972294974.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071315cb1320---zuwitowepixote.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e79d3795bb5672e4e2d67fcacc91c59c/fupufub.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/40425465278.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/943ef7c4af8ebcbc7f989c7dbc3fba75/59296911013.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/26127606520.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/15946329601.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/46d73bf9f1ebc7411bec263201d26d59/16223869538.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/22127385936.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xinepewo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/bukodaxurokelazodobugepa.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa02d73b1f---sunutedipa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c56775bd22a---72304946161.pdfIn PDF document text
    • https://o-dance.com/upload/files/jixavexedurozarokum.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1cd8d2c6b---nupemesepevovizez.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9458umpf5id98r6c58njd4cs80/vitesuwudalisumipap.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b125bd99392---kebogobepebotolowux.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00d82e10d---zuzaruvo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08f9b8029---sijitafadopazazofageba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=should+i+workout+todayPDF 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_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 17316 bytes
SHA-256: 8b15bbcca6ea854313eba21219b1a711eb1abb97209776905c8d3e8383b5298c
font_01_sfnt_off000146be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BE 10408 bytes
SHA-256: 92d24b39a94f42021826a537a216ec3bebacb8a328d4dad8004eafaad669d74f
font_02_sfnt_off00015e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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