Malicious PDF — malware analysis report

Static analysis result for SHA-256 0698f4cf3b9ae765…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 07:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: db58b7996c6c679a9c8d5e0e6eaea14e SHA-1: 245ebacfb0c3d15607a7ebdfc41b643504de4222 SHA-256: 0698f4cf3b9ae765dcf447ce4da9cf8a23032eab37968b0aaaa3a568dbb5a34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://philabc.ru/uplcv?utm_term=he+she+it+worksheet+for+class+1 PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083a48c02630---96715288208.pdfIn PDF document text
    • http://chinahongji.com/d/files/sipexapizare.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/41016555424.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/933f1c6b2e8ea4fefc92f3b43328e9a7/newelavovotegelop.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c59ef843---12801012402.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/74575845556.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7c920f7f---mogipuv.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4fb8bdaa---52225392251.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2c8913ba7c599e605b59267139957957/fotuxaz.pdfIn PDF document text
    • http://rilta.net/userfiles/files/78744368907.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/tupijixava.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31debe5db9---rometemovafezonefatawir.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c42655fa6ee8370488c219ece33e452e/7769366114.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20b5eba15---futamilaxasatojekuv.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/70598143241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c25f5ede0---76732107969.pdfIn PDF document text
    • http://www.grifin.sk/files/3671965048.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e628f59a4d5461be5ea6282ca8e0bf7d/xixedaxipazasaxumibi.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/gomuxadepojoligejenanosu.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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 10548 bytes
SHA-256: dc35df08254b5e350d08e6c2aa202666ee1a4e43e261a944cb777fc96e5f4e30
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16544 bytes
SHA-256: ffd69553f5aaf1c888718a68195a9fb1c57ceb7290d27ddbcde859fb331f5d70
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1