Malicious PDF — malware analysis report

Static analysis result for SHA-256 459a7e3204bb7275…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 05:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6360c5970b381ad2e604f23f5de790a SHA-1: d3f8682df1c6c30fca415d78c725af808f311df8 SHA-256: 459a7e3204bb727569cf5cad0107ba99bbd2b900cf84d81639ee92226216e3f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely used for SEO poisoning or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce51401bd---nadarodezowesojikixuwimad.pdf In PDF document text
    • http://nhadeptannguyen.com/uploads/files/godavizogovoxupur.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/76989737031.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/61960770095.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/dutimaguf.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/tuwiwidi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca91dc9b54---84893717708.pdfIn PDF document text
    • http://sksound.com/userfiles/file/50925814052.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/52721218509.pdfIn PDF document text
    • https://filetorme.com/upload/files/vuwenafo.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/88542503469.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kagedepemanigenamusam.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/riwisafogovikaduf.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/82273424539.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136563d28d1d---firevon.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/wivumabusanuvudorida.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zubogiweral.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/1085931532.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/95995576591.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a154d29---vibinitivu.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/29669198891.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/80699431663.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/20104303943.pdfIn PDF document text
    • http://accronline.com/userfiles/file/92574018378.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/3782576837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+manage+android+phone+contacts+from+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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 17620 bytes
SHA-256: cd61da8abd4ba96a06df2c064fd82504dd2b244016ad2a7237fe41f9e03a102e
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 11096 bytes
SHA-256: e37bd471a184c468d54bf568342418185327be1e4e256e941fc804bfe30a0efa

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