Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4e3b83ebab8d81…

MALICIOUS

PDF

93.9 KB Created: 2021-08-13 15:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1aafd38a9c6a9f6cdd75b21fa691cc43 SHA-1: dfad42193323e4901bfd41c944f646b1c71c2b86 SHA-256: 6c4e3b83ebab8d818afec1b01f6114a152532f97d814c6bc7c9b8e8356db1def
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The presence of a visual download button further supports a phishing or social engineering attack vector. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kadernictvo-svetlana.sk/editor_uploads/system/files/82862805535.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efde9703b95---35668923055.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fn98k47o70bildnqfa7kqqqbmj/visavutukigelunuziriloguk.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/42843248042.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5345a190---32687617336.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f2cc4a01---sadumufare.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/gukosalafa.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/45e76fe665bcf3825613c20fde9f8794/50880247920.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a1667eee---14658506674.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/10199494242.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8399675c4---73840779386.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ue93755j1bnlm5i7o9i47ldqo1/55235795054.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fdae346f678---41471618085.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e5614d6b124835adc3fe2c7c088f8995/debuvinipupinizonafotud.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/53693327131.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/fanamugofekadepofurubu.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gunexurej.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mujazujogalugat.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021073110591865.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608192ed7ed47---1366589520.pdfIn PDF document text
    • https://tonitomov.com/picture/file/tasobotaxirowumekef.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/pijanokovemuxejumowozo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lodizamusixawogimenawasep.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/kodazodetasunudif.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbad7a4d12---dafukapofomet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+gold+latest+version+for+pcPDF 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_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 18496 bytes
SHA-256: 827ee50401cd9cef8b6339227c016187bd1ffafb67864cfd5ed49c294acba747
font_01_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 10864 bytes
SHA-256: c8e433a4cc80cf93b53713cf296f45ac8f238b5422ee7a43ce06d811865a669d
font_02_sfnt_off000150f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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