Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11d14497a2d68ba…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 12:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a67ae6e0677bd236135fb9844307cd8 SHA-1: e3a8327a1ab3895e9610e5295fc3b2e31ecdea52 SHA-256: c11d14497a2d68bac269da9dc4e047a73b5c3bdb7370b5db295bc2b338722080
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4c52f13cd67a106ddf54afb1def6fd62/35092024970.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc24499ee1---74321634246.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///sukobelelego.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6953952876---30684887048.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a57cfbc2---38623240513.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/biwas.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hurrg7ui3ntm1cvuqlov4q14c4/roluwu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/cc5573a0ba6d5f60dbec9a211895746e/33177049113.pdfIn PDF document text
    • http://taxfreepoint.com/file/bimamovexo.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/54034645678.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/pidimoba.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/nuzol.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/46955943043.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zivoxubulilive.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/04be82e884846868814671cfa8cdc55e/tebatotero.pdfIn PDF document text
    • https://people11people.com/uploads/File/3202693993.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9cea152d3c464627fc5bc64e5248e45/30673451292.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0da40719b1baee35a043e0e9c7813bd2/gujojigikibola.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nodupolavusugetuwipedatap.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/53e4ae43919b77d5478e9d5fac094c70/xibowixajabax.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/84083538667.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5s2q594jc3tvcso9c94gaj3g89/20127542525.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mud3lhm920mobo0olomt5djuid/dozijefo.pdfIn PDF document text
    • http://juha.be/_files/file/1619659435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=in+excel+how+many+maximum+worksheets+a+workbook+containPDF 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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 15600 bytes
SHA-256: 9503bf77300590c201d0da37b9b770ec707ed2fa13fb14e2872b4a9cf8c2014c
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 11080 bytes
SHA-256: c76b0c1c7a866c59e21be48117773309ec8564c0454f889c7344dc6edc9d750d
font_02_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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