Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b4c08923ef1eb5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 18:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b040562a651a14a605955817287748d SHA-1: d24604146a30db0a6747311ce1ab11a06039eb3e SHA-256: 50b4c08923ef1eb57afce85877fa39c86e5b890f69620b1d3f9a92f1af4cd5e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=championship+manager+18+mod+apk PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/92342957537.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/zekikogeroxubibokadej.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/9902058361.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9601b08b2---56618244099.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/zozutuwesoduvizijavowafu.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/xisevojirinog.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/lowiwit.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/nazisimipoledumifule.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jvid08rm83d9afq63j9m8u8u8a/1081439448.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/13925499604.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/gipamaru.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/80602076101.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0f14f2f9b32def0445bfc19a180ea52a/1180706023.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/davepepipalonalikuwa.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45405939345.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/misemox.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/5079982581.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/pazexenefok.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/97406161750.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/mekaribovafelorozileka.pdfIn PDF document text
    • https://computerzone.pk/file/nolubivokunum.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 20588 bytes
SHA-256: 931310c31249a2f3003e5cd1911c082f0c2acc318b6cc701bff338c90ad9fc08
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 11080 bytes
SHA-256: ee0e5c4ea8ac6ef4b254c8aae63d14cbb0531f2f0ea7a85f99be9086c4016c27
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1