Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3ca7bfdae9270e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 050aae30114975f6ae944c2b5491097b SHA-1: cee647fcc23540f8302e4d36ad2e11d11bb1ad64 SHA-256: fd3ca7bfdae9270e597dd61193f0fd4bb12fa3e60955a676efdb57226b20f9d3
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://sartor.ru/upload/files/93633508747.pdf In PDF document text
    • http://ippon.lv/uploads/File/buxavejibatetof.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/12432729809.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fapasir.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a95084cf69d2d0b932e92a6b3968bb0e/68305002630.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/77748ee6bf66b1dcdc4aea2f98cd5ae3/sutavoweze.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5de06b48a---wulexamidemeluv.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b7273848e6c30d90c84f5932cb418505/kapululowadoparakajunepo.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/dujuwi.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/14352766366.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/21203434546.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912f700cc0---mevofopiko.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ripifidototamufe.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/losilorixiwa.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/norowitamapegosunatab.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107b096550e---50112734346.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/66130572249.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/38372267233.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/10890128553.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/40269a2d30be1cd4b6f8c28478f2e75e/41953996939.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/kegusazisamizafazo.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/6663454178.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/xekifijepifilirelire.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/narijaxapuzumunoxijapex.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/89250103526.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/pexupanidajakadel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=libro+caperucita+roja+del+noroeste+pdfPDF 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_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 10940 bytes
SHA-256: 91af6e061796aaeeeb43fd4bee74f6ce01982e2e7930c4b69ad6c85e9c6d94f3
font_02_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 20008 bytes
SHA-256: 0a919c7b97bd3b311b894647e21cdcf96e7bc1046dcac71b82f6d96260b0068a

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