Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed1ed393b08f35d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 17:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1faa343a3b40338cd58040ff5fb00b0f SHA-1: 5216a17387970391f2052995305f4cc5620a84c4 SHA-256: fed1ed393b08f35d5de0ee7051a35cc7c1b0e9cf8650daf3571f6d860b4b9703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this, indicating the document's primary purpose is to facilitate access to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=primary+school+math+textbook+pdf PDF link annotation
    • https://kurek-rowery.pl/user_pict/file/niribibofaregafogixiwonug.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/60891050738.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d06b4eeb1---69462635737.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0b777183b518bab01f29d564222c9316/lidafutibij.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/sisodezudetuwaxoje.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f5952ae5---mabakito.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/kuledokejifotorafo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610680afdca20---34669103889.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5f4dc52ugkdf4ebpenv1qormou/fadasuforotabemon.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/98203363092.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7e29f154---20150089384.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/522397166.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/28802426031.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/90713224793.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/66211832238.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/digezowadolibaboviviwi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f95da41183e---foxotoxekutofifanebiruzu.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/73b37e08b455e5e4218e70395031ca54/zulebidafeferumezajunubuf.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10f4520ef---tarorowowosirenobajujigo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/98760397466.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/nltftsr4nhlkrtvqg8inlbj7fa/93807847906.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/26631627674.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/29642520738.pdfIn PDF document text
    • 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_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 16208 bytes
SHA-256: aa80c41230abee366c9823fdc15665cfcd3a714e8e91269255071f6914e78888
font_02_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11228 bytes
SHA-256: c75ac826f08ab294535a7a11d99310d5f02a87c82afacced58735bdbdc12bd1e

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