Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d182d4dea0feec…

MALICIOUS

PDF

83.0 KB Created: 2021-07-22 19:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c86bf0a34d7dcb36857b9f2e08cd3af SHA-1: 464a9535f908913440e876275c263d898643ff2c SHA-256: d1d182d4dea0feec4d0f092bc6dbfabc47bd526453c7144cb3747ef788f34f16
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dba9a129b---5049436420.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d7a062fc---31196797108.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/74783348257.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608de37e5a8cf---15917113631.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086891019801---39279055768.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a89b1719b---lesibovobaxozesen.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7m7kusbqs9kncklodpli4klb83/15824424358.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2882e08e2d2a77361db701f09b49fa7f/68491267823.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/93792732606.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zojufo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b1372da6976---53195486899.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/flt89sa497qml001440e665v40/42288816734.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/30669318569.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/52738145981.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/tasolo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffb4771a64---56750449794.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b2d390ec---33045736806.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f05f099---dakobef.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f25b9a93d---78870727991.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o8cn2mmss321hkcfoac075f2nn/doseletutidisi.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fasosisame.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4fe2dd6bf5d6b5f3618083f23e039312/8037269147.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c8f3adba---tuvovufebiboxo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/336ab4b61cdc709d05ce1b58d84f0da8/repedezotupamerofotele.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/0f65a5ba4321d93f39d0b562f46bf5c4/bowisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=purchase+requisition+form+template+freePDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16232 bytes
SHA-256: 655d733223e2b02ecf9f735ebb3d400cd527d5573f9801882ac2779bac24a13e
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10992 bytes
SHA-256: 9081f783387635b62f5c9d23dba70e7e21eee2408d20cc93ced38a12ce0d8d30