Malicious PDF — malware analysis report

Static analysis result for SHA-256 2456393b9be19ecb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 07:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8697c1c78c07aebbb39a1717f11afd4e SHA-1: c6203b079abda4b6cd10e107cab54f67ca3f6ea0 SHA-256: 2456393b9be19ecb999f35330146212acebc3207041ac96b1732c0861a40708d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=short+story+writing+exercises+pdf PDF link annotation
    • https://creteservices.com/FCKeditor/userimages/file/kexijobaxokajaw.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/75960835897.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b936cb46---84492004239.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/benofobajateku.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c42798c69---88620846832.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fcc962f41---zubagomeneboto.pdfIn PDF document text
    • http://blueyee.com/upload/file/232343486992.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/midazepini.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/runeriwuvowotesafuwabe.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7849ea81ed---31266438280.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c9206488eb2---63893461406.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/92277856144.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/27682094774.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tukevimafetakok.pdfIn PDF document text
    • https://ijpdua.com/contents/files/96691556164.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8affda3e36567bcf0cf569ccbe36d961/34927635123.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a6edd39f58d0d40c5dae80787ad17a07/84499580766.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/gagine.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/buwigamotelus.pdfIn PDF document text
    • http://wenxuezj.com/images/File/futisuzes.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a28a92dd4---60457080029.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d70f593dd8b---83475128561.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44d8b1d853eacf52fef668ab610f564d/15622518361.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 11068 bytes
SHA-256: 7c45b4c09c7112f3cf4b46ef1ed6c5be166d227590c8eb9649ec886d2c3cbcf8
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 17352 bytes
SHA-256: 14c07844de74362744ca8d261f7ec8ef68ff7838ca75bb1d6f451e75d9cb56f8
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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