Malicious PDF — malware analysis report

Static analysis result for SHA-256 c045ce1729d001e5…

MALICIOUS

PDF

96.4 KB Created: 2021-09-02 19:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54dd132f880a4daa726e65ddd48bbc5b SHA-1: 105415c4745b8bf3d3391b9b729f20a8b8286fe5 SHA-256: c045ce1729d001e5498f8d2ee8b35597ffcd8d3945221eb4dec90fa7c68a7c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. This suggests a phishing or redirection campaign, where the PDF serves as a lure to direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109aaeba6257---lemotimubaf.pdf In PDF document text
    • http://ingfrimale.com/userfiles/files/pijuwulinujemubodiba.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea7441ebc---74578304362.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcc07ce06---91865174905.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/xelojugute.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c14d6857---dofowu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedb705f67---99472268100.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/908738cc214c1ce2cab345ba1f65eb54/58972036020.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/defubowab.pdfIn PDF document text
    • https://puppometalli.eu/file/puwojodepilipomazedilunom.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea758805ca---30211639859.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zudugujiteroseda.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d68bb67ae---73769205533.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9841aa9989---zetutipetozinediwufa.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/9218195572.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160733220df687---memasiwavabezigasok.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4f88b46348c9228c3fd8604ce8571615/19525849976.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e11fe7f7e---wawebinatika.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaae8613a---15691260596.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f9456cafc94ce3384a1e59483a6e3a21/sepade.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a58dnvdb4qildgg3tlh6290ra0/pufuporeravuluweliw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2950f7c1---lobirumukeluravoko.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rdf01biin6mug19u7j6ihiqei6/pidegasusi.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/fajagifeluzuv.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/95457652130.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/74442058798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=camera+connect+app+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10408 bytes
SHA-256: 9cbe226215df1ed4fd894a122904a7b0dfb395fd411286b598b54302847d5fdb
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 26220 bytes
SHA-256: da26ad85ea3e7a82473689ec270a27f46d57a94efa70af8356fed444f7865177
font_03_sfnt_off0001532a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532A 16364 bytes
SHA-256: e6186e999161ce57077d025d0c52f3bcedc48b6cfcd6e974919c4cf2602c20a0
font_04_sfnt_off0001699e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699E 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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