Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de69e18a64b11c9…

MALICIOUS

PDF

136.1 KB Created: 2021-07-01 00:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2ded9d19315afa95567789805434fd09 SHA-1: e70680e39ee06e86c1de49ea3fe65270840d184d SHA-256: 8de69e18a64b11c9f8b9e03eae333a190bee5d27caa57ed14abbd6a92c93ce05
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The primary attack pattern involves luring users through a malicious document to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s34g362rkrjsqqmivjvd60bh43/19024480106.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/50238228902.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8fa12451---79990503740.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/eafc76ea1458ebd352138ec9acd28877/rutefipida.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/zulisevarezarazuw.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dfdc22da43050f516b4a1b7de4829c54/82277229480.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9uuul5c1doo91j3t9udstvhuku/20104861074.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160769cacc68ae---12182486187.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6587764640.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0747c13471---30341434820.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/xakozanapolaraduloki.pdfIn PDF document text
    • https://alutat.com/data/file/fenomudosagu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/38df8f97960e547f60273618bed1e1d2/vibedabibawoxonuxogafus.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10ed9e3ed---75620842191.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a5fcf19d---52763893284.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61955355679.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/xoxulegodowubore.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4098db4118cd9adeb6f384c4abd6d965/98455254709.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8294c2a8ab---84178186944.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/32527316016.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/1480673096.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jukozejifes.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f92aef87---fakogakurip.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/gamosigibu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaeef19ba0---fedajevomu.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/fc2bfeb7c459a86037f2ee80222cbac5/bapadobab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=weeks+go+byPDF 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_off0001b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B212 10020 bytes
SHA-256: 672c790626ba3051ff9ec57ccf72c0aa294c05e1cfe8433cfaedc011143af291
font_01_sfnt_off0001c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C877 19824 bytes
SHA-256: fd4c72b384b381778ae71ca62f84400433e9be260c9ed0f329f0542ff4b4fc01
font_02_sfnt_off0001fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1