Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f478016ff7ffd5…

MALICIOUS

PDF

93.8 KB Created: 2021-07-13 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b8adebdba9f495effd525b9a6ae0996 SHA-1: 52bfbc9b344ac3af2111fe8dd6f18e980d3966f6 SHA-256: 37f478016ff7ffd5ed67509d02cd082c0efb865201fe263ba9ed95cb50f2f119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b11334089374322aa134b90b01b23ed7/89341754442.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe683667e---81602984415.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c83044ed---76035206730.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/9e1510f0c9ac25e5c73b657a777b4c09/dofedobijivimu.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/tavobanojerirukutanoduza.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59b3d8fd5---tajejerati.pdfIn PDF document text
    • https://rajaunited.com/contents//files/tabanuti.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c334e0564---18053491285.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/menigezamibixoni.pdfIn PDF document text
    • https://brs.jo/userfiles/files/55687595032.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/62470531981d35ba299209f0d95afcbb/madumofisese.pdfIn PDF document text
    • http://dytac.hk/userfiles/gureramujegapofidowo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/6qg351k99vjt652rt8spge0gq9/gumasobomifadunuwixisad.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a2cbb980---1694931649.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/94573406944.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lopitigesedajar.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607108463b782---rivadepijitulolanetitaji.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/95890054986.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/sisosetatebimonodegijir.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/23565992911.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b348efbaabfd5e0bac74fd8e7a1249d5/33751154206.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/19c8827c4f3f1abad9b4d17b1737cd52/liriziriwomalikifimije.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb841949e8---12538531376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=distance+kalispell+to+glacier+national+parkPDF 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_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 18072 bytes
SHA-256: d87c9ad53d2e4eaaffc9a1022816d0627b67eacc85aa71800fca387a884d86b9
font_02_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 10644 bytes
SHA-256: 3070c6c2c7058735b837120077ed0bfca6e891385e694233b92b02a074467c21

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