Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f2395d683d56e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 20:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e195290499c278118e3389b79553f1bb SHA-1: bdfade1a7e154c46e65d1e143414eb0baa4acc62 SHA-256: a9f2395d683d56e6ad10e33b094e84bb9f73acc3109f7cd6c5542e90326c0123
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://saigondome.com/uploads/userfiles/file/jukepowuxobesovaladave.pdf In PDF document text
    • http://patp1ryb.ru/media/file/7315694633.pdfIn PDF document text
    • https://anandalaya.in/resources/file/bulogebaxemelifomixu.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/7278477450.pdfIn PDF document text
    • https://etadelloro.it/images/file/vepokorotimi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f80a7f538---86884503478.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e071db1eedbe8da94b8e091a92467473/17890136614.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/41710675053.pdfIn PDF document text
    • http://rhondachem.com/d/files/mufewefufuk.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/fanudo.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/67260951227.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e38b020a6ad5ba634e9b3cc9428b1d26/28596172289.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/9786406462.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/romudavikoparidak.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210902141418.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/22327723233.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/3267781844.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/dejezigumop.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/13965762270.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137351a63448---47283659029.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fafetuvemaronuwa.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/durixatupexaxanidat.pdfIn PDF document text
    • https://jobtiara.com/files/files/7763806611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+usb+transfer+macPDF 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 10812 bytes
SHA-256: 7803cb46ae5291ea731d665029fa8245539a24a12a33e8b030d98cc5d8db7405
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 18272 bytes
SHA-256: c20bd30ff5daa48158b21e833eb451b8ed7159d74e4435818850f5e604c95752
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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