Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2775d810fba5d3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 10:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0ee74837c52618dbe6e7c3a85c99919 SHA-1: 2e6feae254e832ff63dd62545ecb5de0570ca72e SHA-256: 0b2775d810fba5d3a3023019e611a60154dd11d5bba595da56ac36121c04588f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final destination, likely a phishing or malware distribution page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=financial+help+while+studying PDF link annotation
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/62398295972.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/dikekinitet.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7b8cf064---dutivosituximeregeku.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wiruneroputavotuxa.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/84492665399.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/49072012371.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cae536c4e7e4bb2c18ba294caeac7211/wetitotefivumawebujek.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/83ba483a1c7819dcf9d11b58d0333e40/gojeke.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624136865265543430.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f88e1ccacde8e8482a92e545dce1dd59/zisor.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2294d8139---mamisexujijajesipebap.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vepugasit.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/niranadanomitetedabom.pdfIn PDF document text
    • https://davaocarrental.com/images/file/36064565182.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaf26243b1---42168925154.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tewoza.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/16956477194.pdfIn PDF document text
    • http://manu-transport.com/documents/file/varopomaborarunak.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/35883177990.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46384ec839---88050807911.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/gebatedowupovufin.pdfIn PDF document text
    • http://domainecomps.com/documents/files/14869212391.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/furom.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd4b615c2---luvusekabikogutu.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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 10852 bytes
SHA-256: 1b4c81cb31d8e591719c0d260430af8069dbc5c12d346f2e10da8173af26d221
font_01_sfnt_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 16400 bytes
SHA-256: ced48847aa3d22bacdfff11cc8688b8b09bfebb5c2e39fb6514ee5d30d228698
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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