Malicious PDF — malware analysis report

Static analysis result for SHA-256 064c71212b2aa203…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 22:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9557edf21bd3de521fb4cc6acb23659a SHA-1: 0d66bc683915a54d62cab30bdd25cd3cabef26be SHA-256: 064c71212b2aa203c5cbf699c5966a1101bbf260dd07ccf2e4bf85d1c98977b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to compromised websites, likely serving as a lure for users to download further payloads or engage in phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=fantastic+mr+fox+novel+pdf PDF link annotation
    • http://fabriziocar.it/userfiles/files/1780228856.pdfIn PDF document text
    • http://orlickachata.cz/files/files/34735623338.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63921476429.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tivevutajixi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/48985d75a080a8aee3c8ca4a605cd962/91344830712.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/kozazifezawaxotuva.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409006c15e8---sonimenuwosuzulisujusaza.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/74447566941.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/98922711873.pdfIn PDF document text
    • http://teraval.cz/res/file/kakexuboloxuk.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419cd08f12c---2935620753.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161348dff5434c---jukamo.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/kaxaxisukoxafokele.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/46039006142.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/malosunorefajazimadib.pdfIn PDF document text
    • http://kaies.net/upfiles/file/vupedufamebekufaxemi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rapuzeviwixanatupifijewub.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc4257125---jasalikozijuwizimadelazuv.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/69807384864.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/dazukawuw.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/rojojutinuwut.pdfIn PDF document text
    • http://tfforming.ru/d/files/kapameruvugobojak.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c8bdfadd---biweve.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/zosorupag.pdfIn PDF document text
    • http://hotechike.com/files/files/xikerexajobimusi.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 17936 bytes
SHA-256: d28b0af27efa070b10f826b334bf18d7788aff207f1457712b664826d57e5517
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 10924 bytes
SHA-256: 5e54719f141ff31fd5719fe21738aae3637adb1374cbe739f183d878cd826e30

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