Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a99679564768939…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 14:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4013a96b2bf36f392245f5c65bc6bc1d SHA-1: a5a184831748d9317f3cc3d570b592b293436ba4 SHA-256: 1a99679564768939fecdb8dfec5c1985b4eb57242e84cc2e5f9741a1d98459af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=php+split+pdf+file+into+pages PDF link annotation
    • http://ebrinteractive.com/userfiles/file/kavozexevurav.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/949b262686dd131cb97069ade1524ea6/58980499242.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/83d83bae5c3aacbbca1c6ec67796b816/fowojaweluxokusobof.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/bafapovinewopudigadarif.pdfIn PDF document text
    • https://2acontractor.it/images/file/81699432835.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1239bb0411---89200600618.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53607319060.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rusazok.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea1b82c7f---jalutilogekes.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/wubenajeve.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/fubiwi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c2fa23ba---31726048932.pdfIn PDF document text
    • https://banghenails.com/upload/file/tesefibesetuzof.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110b3947296c---waxejizupur.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/de0b772237ac81f0ad154ac3e4e7cad1/zapobavejaminadofumizi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/40216d207f11840849b62a6e23b272e7/25175066085.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/zovefoguvadamotakuz.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db0818b3b4c---ganadovusapake.pdfIn PDF document text
    • https://sanidom.pl/img/file/3731327302.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/66068483663.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/mumob.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/82262424848.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/xuganubefekuboxikatep.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f373a553d76cac71a36b2d88c212dd4c/69914152464.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/71256265945.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/86303449906.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cpgm77389k6mmag2igt895npq8/16939294286.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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 17476 bytes
SHA-256: 7cf9799faf44b45da0ebbeb75de11b0f7fb4332410d6b5d7555ab56cb1ca8991
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 10680 bytes
SHA-256: c9260553848bcb420a24e516584faac18980ed0e0856257747378035781803ff

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