Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceba66945c2a034…

MALICIOUS

PDF

189.6 KB Created: 2021-08-07 00:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc0c85d24edfb3a5d12c2a8ba1d36fb1 SHA-1: 42947c465263b6e73aa28b9635b9ede7cc4993fb SHA-256: 7ceba66945c2a03453074323d1d97f20cd7f86e278b4213a87045970db5ec470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious documents. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign designed to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8148

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9e7c8e91---53729747268.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/dipabigejo.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/f991b36361a714626d6b4eecb47d5196/58278827974.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9be452c8a0---jogezegevejawozexusutew.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lumotodofakonujofenanura.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/90358499478.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/915um9s94qhbe2n0v0ekkq2a3g/16989017690.pdfIn PDF document text
    • https://inncredel.com/uploads/semufilejavojubofa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3348a3377---gibonizikexileri.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffe332b5e---masetuzojofukuperim.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/5488258711.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/90500897661.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/02a8ebe8cddcbb0f69a2ab82835aa58f/sabamaxepof.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/komutujesifilejisutiki.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gizifi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/149744ee9be28464a3198dec84e11167/51780082613.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/61870365393.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/82369265888.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/pigidolujivuto.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609912f1e8aac---tovadilutolegowedewotadu.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/89146474546.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b702f0c6ee4---lujoxakozajaj.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/92648725674.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160958f408d9bd---80114636885.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/jegeg.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768a6bd21c3---80259309698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=les+mis+broadway+cast+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_off00027c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C49 11140 bytes
SHA-256: ac25b8563107117721c2e4e75849a9b64041663c31d47a7931f5ccab01d7c3fe
font_01_sfnt_off0002967f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2967F 21624 bytes
SHA-256: 23ddbc0c4c97ade139c01e751c49cbf66eaae613fef96f5982b795951b464fd1
font_02_sfnt_off0002cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1