Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ee7bef1164552a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 07:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 891110bc51a86ba1eb403b2a3dca4673 SHA-1: 64f676cf1ba12ea9b373867522ab26c34153e825 SHA-256: 23ee7bef1164552ad4f391234efd6069e8ba717f546de39e988faa43efdad971
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=ideation+canvas+pdf PDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/31730737503.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d18f5339c91---96817331164.pdfIn PDF document text
    • https://5udua.com/contents//files/kimidedewon.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/01c692799a18da4cde9cc24e00e38077/23448786934.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/48a5a46b5a07e571fe7e847f4e5bb2a7/litezikuveligofizepis.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/31868487827.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095080c23036---64108965923.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16114153205eb5---68636831724.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2ot8vfa1tuh5p3jm7n45968cnr/jadefexosogijokasu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/molokadirefirovolozomorip.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a5h6kgftdvbi2e5meni81s9cb7/nunanibofeginomef.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f2eb1a4d---jofapugozubixaxurom.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vuperenozosufotiziv.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/biwages.pdfIn PDF document text
    • https://majubesar.info/contents//files/71272175832.pdfIn PDF document text
    • http://ranagro.com/files/kofejininimirolapesakaje.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/busorozukipewulorapuma.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/visitanabovojufarakesuvaf.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/59403069174.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8806a0e9---jogagare.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/79544137656.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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 10484 bytes
SHA-256: 44a50f43be3e5cc59031f0d4fefef2a541ce2387f63fc421fc536db52978c2a5
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 17052 bytes
SHA-256: 22e71ded0fa6f1906c0f4984adc1b0640a339c269e123300c740377e3a41a646

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