Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b585368899dec3…

MALICIOUS

PDF

87.5 KB Created: 2021-07-27 15:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a479475409a8948ef793e0027faafad3 SHA-1: beb0b00e67653ccf65335aad10976ecb50a03c33 SHA-256: e8b585368899dec32a7d0c518e9a2b7b5dddb2c431d2a8c14a9274c4e72941b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS upload directories. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, and the presence of embedded JavaScript suggests an attempt to execute malicious code. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160901df8b423d---4787635328.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7d9c23919f3a371207ad2ae5b3f262e/sabow.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur0jpvm041u4na9lep1sl18geh/95722094141.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4426725e35---muzidijevoluluzup.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e73a9f5c---midisesariw.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/79698a4dbf23b7312903d5627f349eb4/divufikegibelad.pdfIn PDF document text
    • http://sooclose.eu/upload/File/bizofebawoxugafowevonuwaw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609059a5b4d65---pufuludut.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/natowopi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/54414739847.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608505a88ca52---tobofuvoxogenodezis.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/36227507234.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccd7279a0---muwezedamomodoletuvoro.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97b144638aeeb63ca1a6ee9846ad94ad/tavezonevato.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f257b3efd9---48010957937.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c32fddd2e83---kijijumilatakiso.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/do6inc4ji0iktps48vdpn07sm5/53638211871.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pad49qtughdsimuqfkjo8vpvm2/13297837807.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/98203253581.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/4513492166.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukf7ejp5orpjavjti42lrorno6/litilowubezetuvazemido.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97607370943.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wikefen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=poweriso+serial+key+2019PDF 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 17248 bytes
SHA-256: 831e1c1b585468d369c3737fa2f06c0f9bb84e461367d0b05c0fb5ade6ad21d6
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 10652 bytes
SHA-256: 2e23766f292be1dbdec5486b91f8e510d3b67868d7908948c28227fdef0277b9

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