Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d1093b0db3de2c…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 22:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd0b6aa8918d3ab25da98c2a6a26c3b0 SHA-1: 01af0dc07cd42b6a73d629740b37181d449c912d SHA-256: 85d1093b0db3de2c763ef4e9f688508f50528ddc0e12a44b89f8d2bd9b896d20
164 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 heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress sites, likely to deliver a secondary payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d3ae5815---44268951998.pdf In PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/77252975161.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045bec27bf6---voludalasomojidesemari.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9irfbfl4t1lmg2lagpl5tdcdf3/vonozivewejotefegokajo.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/94352695155.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/givebo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9uh6htcnvqmjruncgcaquifa31/17623151499.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/jabasifimudiko.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/123959935.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/3559622986.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115781b0aaff---voxolifinijatukig.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/32919443466.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/56a065047952c66ef6d95ed4b0efab8b/73028305891.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/pilenurogizobitesevoko.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c937767057---jugevenanivadesapid.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f02d4033861133f551d6aad44226d57a/basugibosat.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/10964590485.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/mabanidafarezolilol.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/wozasotagedubunuzavi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b3a7a24d0c4bc609250039e70aa0322/dakov.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tatapapa.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/092110529369.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nixeretogopineloxatus.pdfIn PDF document text
    • https://music-group-store.com/upload/files/nudawisodekavinil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sbi+deposit+pay+in+slip+pdfPDF 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_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 17348 bytes
SHA-256: e163b46a508eb56eda8e22ef4d9061b25551e9c8ecdb77361988247750e281ac
font_01_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 10720 bytes
SHA-256: 2524f6f5ecdd427b558f2445f5413a05cc4228ce56efb05e5e8ae4da2e0bebf7