Malicious PDF — malware analysis report

Static analysis result for SHA-256 017b04412f68c27a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 09:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c39bf916f776242319082d223e3f9681 SHA-1: f7cd2ad0b6372217576c1f6f0674b69fdac99180 SHA-256: 017b04412f68c27a082da57629613c265132847a455fd11c5fdc9edded935938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=ap+statistics+probability+rules+worksheet PDF link annotation
    • http://smartdeal.pl/files/upload/files/likutofonizobugebidogev.pdfIn PDF document text
    • https://tarsiman.ee/files/file/mazotujuj.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429b22586c---raziwexawasobawikedoko.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab582f954---932606712.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5627f2b8e---kabonufepavase.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/2666388789.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/kobuforosadutesuzenepanob.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/merozafazagomozito.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/77960913022.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2d0afeaf---vopawagupubokunoxin.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-8/20210908000806860375.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/55895631661.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/35018195236.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/ff29ec704573405e41d71e7096a5a619/64599452955.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/98617415867.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/14554987113.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/99136447491.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/28540238963.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/30223527504.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2878c0f31d90a0be1ef1d2a34cd28f19/15283928771.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/91121259311.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/81378786935.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/98947124127.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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 10880 bytes
SHA-256: ebc06472837f89a1011f188246779fab1c6fd9fa5e9ada23f5b787f7f2d5b6ce
font_02_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 14164 bytes
SHA-256: e6d6d5043c5d26ec0a0a4fc364f75846772cc4fabadf76ed782afebbc41f0b1b

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