Malicious PDF — malware analysis report

Static analysis result for SHA-256 92758184cd22d14c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 09:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7916fda74766d0c50e8e9ecb988485bc SHA-1: 84206a67295a092f2e8bca1b1571c399f7a8e30e SHA-256: 92758184cd22d14c56219073e4801be22c2fcf7f6fc119ae2834ed44ebb10641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=how+to+build+a+working+boat+in+minecraft PDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85709986569.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/19468801159.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b631b2bb705---zobumapiwole.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/71623487571.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sifosusadonolexopab.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c4a9c327---37606782816.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f5613794ded8fa7ff9713df4777a5d61/94130759005.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/162a189175217dbde2a2b06f4570aff2/bikezuxibapadakolaloj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1176a82d---54008452473.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9657b2c0123f5ba1bcb502dad1a04c72/97790289541.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0ed53f9c10f1f3d7c085e64623f5607e/50485829900.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/vozigego.pdfIn PDF document text
    • https://cecprint.com/images/file/3725839891.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1c82bb0c---19592935887.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/cqqak5jrbrv42iovtqrdo4ukdh/76141699508.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e78b1c1ca---zisoleve.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b1oi91bpkksfgl6cc7gsh6e7d6/xibawilotuviwetiwin.pdfIn PDF document text
    • http://goref.ru/files/file/wosoxelabujajudeg.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/93107213659.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ribae2c103gdaaro6rk80bhtc6/dopofeda.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609960af9127d---60541537092.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/nabuxosiwifoxafa.pdfIn PDF document text
    • http://wwstationery.com/files/file/gulepanavuwiwubodibixawa.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nixozijogejozumilipimoban.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/43462328110.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_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 11060 bytes
SHA-256: a99a04296ac737a8956cff497c458f22499857ca22d9f530649d92fc44f33d60
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16360 bytes
SHA-256: ab510230cfdf3b8216eeff56d7ed5877ebce30bc97a90779c4033b898a11d9e1
font_02_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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