Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fb33ceee27e60e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 11:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c486c1b9a6f1096f516d41b3cbb6859f SHA-1: 54aabefbac8d0f35c6350a777e35b5ff599fcf06 SHA-256: 76fb33ceee27e60e5f20c70a7588046708c6c53852beeaf186ec62e41ee5aa21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lecachet.fr/docs/files/21444739716.pdf In PDF document text
    • https://cortopolis.ar/userfiles/file/fajike.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1544ed05---ratofif.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/83157321293.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/47228170736.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/zofozijewevuz.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wagofavurazi.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/labafejodasasodomon.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/34369509227.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/35320931049.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/fofix.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9e891363---wuwixoromuroxar.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/63882166162.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q2f2vlrp5qu534ht0rijkdov3m/51629778917.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/3824417256.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/43187287390.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/71230960937.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/zobup.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/xiwefebopupaxujunos.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/69732463271.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/tiraloz.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/7543716704.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/69141256616.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sasedizunaw.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/dapodobepemekokevokexigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dubbed+movies+online+streamingPDF link annotation
    • 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_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10900 bytes
SHA-256: 5c0bfae0aba95536ab28b0bc767be65c3d5eb81a0f6e0793fe0247bd4dbe01d3
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 17188 bytes
SHA-256: 85807214aca504514373bf5bba610096c625ac07cc612a3f125a30edb42bc8be

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