Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d48ceb051b7bce…

MALICIOUS

PDF

92.0 KB Created: 2021-07-31 20:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42fff6c61166aa82559ca27baf6aa520 SHA-1: 6bf6c639fba4fe4a3d1399c8dcce8aaecea75682 SHA-256: d8d48ceb051b7bce1c111d89e51fd22c165694c82ab062d2ff6b6ff24378fcd9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded URLs suggest a tactic of using disposable hosting and link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878403a1c2e---91499410639.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/p37fu9q8m6m2ujde30bd9u7qr5/32664061376.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/pirove.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/80020117112.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e452ad37---49223752805.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/47074125856.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xetumibip.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/29eccd5a5d3a0302e8c2085002077f54/fegofivifigunukox.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609860d1d52ec---43069326953.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xudimalugiros.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/dfd19a57217f54f4efe7f5a33c9e7f71/xilikenofuledujikufula.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ll1sd9ca7eb5aogg0atqugpkpd/77151445731.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/nobudutitifovapobinijenus.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kuzezapimivumer.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528160343.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f012d4b8681692d8bb592a56ba03398d/bagiwiv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e03ccf9b0f884c4b4430f306b6afb4b/gotewixesorogewulu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9f7922dfe1fcfc8ae5696d6fd3b4bd90/taxizo.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/6607811079.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kilagibadedexebe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/q0f3i3ak708ieoelvg9n17eis8/38461226860.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/42468589116.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc06b245e---juwomivevi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/941e1da48c73ece2a2b1fbb4cbc5a402/5807226281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=goodgame+empire+hack+online+freePDF 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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10932 bytes
SHA-256: 9e21ee29c7271ea05b8a630458bc37c7f4fc7fdc34c7ee8786951e1a9f2e26aa
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 17616 bytes
SHA-256: 7e1fdc6e58cc1668d3098c1a16cd120317898dd03821bef0275bd225bd8f0a68
font_02_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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