Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd5cdb20cdd2e94…

MALICIOUS

PDF

89.9 KB Created: 2021-07-22 05:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ce26362198c56089f905498fe83a555 SHA-1: ab4581647d149c9764430f71d991d840038714af SHA-256: 6fd5cdb20cdd2e94654a58e50ac078274efc2690b1889e70b3700bdcb61af273
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/984a1c759f587e1b84bb877cdb34c3ca/rodopaxikatusoxafuvoriv.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3c3c1720---gulipegujisezo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d9c5cca1b---64699826966.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/omem4j5qudpsu56iga3vdj48ne/6145552977.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/84805960986.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/litegim.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/49f0260351ee87f61c843ea384abae69/julituwoxas.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///8837470407.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/95498770809.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/powolivezorenaromefu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/bopeniwipedovaganoto.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b58f65ad9---83901948860.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/508cc52e683ae7f073dbed64b4a08c48/fozuvibil.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mofobololepiroxun.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/94fe8776517fea7a1889da84828c2446/serulekow.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075b36acc72f---40113112257.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqtn0hvkejeqatodmlucl8skk1/36134023593.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a57c14c97d1---83681324023.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e2180b93---xudusojorolejixedon.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5538e3bb148d62a4fe2b2710aba29f14/76265930051.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/ralamomedapefawijiwolovav.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/kewazamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=father+to+son+question+answerPDF 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_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 17000 bytes
SHA-256: a78d2801364a619b90a3f5d355d804b92683f9cc443b6a0f3d624caa0035548f
font_01_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 10468 bytes
SHA-256: fbd70a13af7ca5d0b47c46f63d13c1e9ee3469e35f84cd4513e7f8565d4a9b65
font_02_sfnt_off0001416f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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