Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fb3749449ee7d7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 20:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c1f8ae7de7a0827274def5c6bdf5cc8 SHA-1: 021779a3a76f96263507b52071c7a9a9db5d4e18 SHA-256: 45fb3749449ee7d7ef077da88c77d42283c21aac7c41b40198af39e3ed576bb6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=boss+gt+1000+effects+list+pdf PDF link annotation
    • http://sartoriaventurini.com/userfiles/files/fuzupefedoj.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/ravupuge.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900a80d931c---32353103374.pdfIn PDF document text
    • http://nakatka.com/files/file/livilidupafafo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c516272af7cfb7a86ea5bfe89d0e0387/rijexekitorugilekej.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2afb342f---jujoboga.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dc62ce44196dfba5026d45b6ee6df78a/19957919371.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac156655bcc---62760597667.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbcd1af9f6---leboko.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/foriribepevelisedewixumuv.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/dixevusomomebomaze.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/6141175010.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/fevepapafexa.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/buninitubopulunas.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0jq8bufhmv29ir548cbmt9p290/vipidabo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1638797441612f3e01e040f.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/turijazer.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 18832 bytes
SHA-256: aba4030d562dd4ddf931fe38fac4be3b65979100f2e9ab5a2f702d872da2fdec
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10656 bytes
SHA-256: 2a99371c36eb42747e895c3eedc068c3d91b7781fc8c6e8022a9d79672f0667a