Malicious PDF — malware analysis report

Static analysis result for SHA-256 309e2f78fa621476…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 22:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1bcb91f927dc13e58882848aa116b2d SHA-1: 6c1efdb6c525a3030aaa0330366ff5664734872b SHA-256: 309e2f78fa6214769cdf742a162f8d451e91802c9b66158d4ec88ab1396dfb60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the nature of the heuristics suggest a phishing or redirection attempt, likely to deliver a secondary payload or lead users to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://audreyheselmans.com/_files/file/8936204660.pdf In PDF document text
    • http://museeducuir.org/upload/files/xutelowadovuzikaje.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c551335a1dd.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/rikadilanuxuk.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/xolaji.pdfIn PDF document text
    • https://atl-50.com/files/file/99134385805.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/vakanavaropok.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6g9psntq88233dohrip34juuaj/lulobobosobesimodazoxu.pdfIn PDF document text
    • http://seritour.com/rsm/files/79678007782.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/jemejesujowojiwejuvaf.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/41527774931.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f825ccb8bfa---tewikikaginizuwuzorixonib.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fuvorulobebu.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/88232387743.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/vowawegi.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/ribaguwubulogamez.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021073012031673499.pdfIn PDF document text
    • http://bdn10.cz/files/file/boxunizobatupasoxafosorim.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbed8cc2d2---62059816572.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/dofodawuf.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/xesabu.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/nezun.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lamavunomifudemad.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/49105460771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=raymond+verheijen+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_off0000b6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 10804 bytes
SHA-256: 91ba5863fd4877ea9a091f07201bff513f3dace3f03063a147ed2db419647486
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 17360 bytes
SHA-256: e432f54dfe9bd4243962e4cb208e0372dae4b07c1461ce023bc382c70feab765

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