Malicious PDF — malware analysis report

Static analysis result for SHA-256 2765e833d065d52b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-25 20:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: af1185ec42a9dc503a003af7b7f5fbc7 SHA-1: cd0060d8bedc4b5c0793d4456763d97af0cef2c7 SHA-256: 2765e833d065d52b717fb73cccbfbfe6289a3076b266194e62181b8cb0e269e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/j9j65rtq92j1k75ul3bntf9dsf/8449239762.pdf In PDF document text
    • http://lumieretvie.com/userfiles/file/52511047007.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d78442c3eeccbf79c90d78e82c51582f/gomiwiw.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/wokor.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0d3e6be022d1fec874f6b54867f729c9/fuwoxedidinutixo.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tetax.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/83801025076.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210523204357696763982.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960ef6a8b29---90415259984.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/19295712525.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/10705527363.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/pomewaxarol.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1ji5labat5bnbfnrig0e94k179/16088994144.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/sikaresiwomigapiboliferen.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/gudexe.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2644felitbqu5fql6cafvjlus6/dabaladosera.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/jiwevagoketimogibamikok.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/74652932590.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/rudawodenotujofojumixumon.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607485389a0a4---14939907943.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19554690576.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/xapijodudav.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889209540da---jukizakat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=como+desarrollar+el+pensamiento+matematico+irma+fuenlabrada+pdfPDF 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 11052 bytes
SHA-256: ffdc3980a9e3f7721b903209bb3e5d5a2d0e1917fcfc3e5eda7ee4a25cf17173
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 17300 bytes
SHA-256: 7cb9d8fec0afd58cc0015c1babcffd4f2d1cdd53bd9c7600a1d7393ee4470826
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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