Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c6c75747083e7b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-03 04:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da9fb11b395ab16ce96e8de30bc26ef7 SHA-1: 5e159daa62078027b34cd914fdbc9aadd733c06f SHA-256: 35c6c75747083e7b334ad0dbe60697d90e7329ab14c656e73b20f4bad3caaa1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URIs, many pointing to compromised CMS uploads, suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=legendary+moonlight+sculptor+volume+49+pdf+download PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3c3cdfa3---57271020758.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jugekatefenuvolomodonabo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jc3u2nmgbb5o1kf5p3krb4chlk/zexowodagizutosivedevari.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4baa7e5b5a7da92a0058f853a40b9e7e/50524489280.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbafb6bac2---pafiwawexokaxerepedo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/44a78fb4469a77a2a41143b051bf8321/53736788001.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc3e76e81a9d22950783138f59ab0732/dusamodalapewov.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5b8ded30---6964611483.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/vurabi.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jamalolisaxodiridu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/xinifaposodejugikud.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/26128491633.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2g5ejc1a8kc3ifkcn304ihak55/giwodovupatajefusazutopir.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/vifivepiwuxiperewidax.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6bfd0f2473f9945f921939d91a2f04eb/velutora.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/98305392740.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/97680358640.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/88273822241.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c40977eb1a2---levovub.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd0b34e---dinofekazilatefofaj.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/vakumirexus.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a70f3584e137fa26a83cd3d5f37d075/pinowamutiv.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/80695246510.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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 11636 bytes
SHA-256: 16fad3e14828b4cee4d66b5a945ee8c51d653d94ba1e1315cc40d4145f19e35b
font_01_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 20180 bytes
SHA-256: d5381d8b25db69186de4f1edeba155348d80d83dd61460f24ee4fedbbb455aec

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