Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63bb415b8bdd8d4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b1bec7fafaf4a6322f70177af0fd797 SHA-1: 25da8271c5526b9e8b9d1a203a7710a8e971a254 SHA-256: f63bb415b8bdd8d4b682e5dee67f8be9e9264b76cff7219a28e0f8c9d5bce47f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to lure users into downloading further malicious content or revealing sensitive information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a deliberate attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://timnhanhonline.vn/upload/files/giboviwategozuwugo.pdf In PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jikodidugogukusabafoli.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e97e6d68700---tikapigapuwe.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/vilovajuvividixurax.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/190198459.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8374e5c40---82394634155.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/fuvimutefefuliwemip.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/liviwuxabikakufurur.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/89f2b89e54985fde511e8bb215d73094/21309480677.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/80383159975.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ff3ade48---88718795624.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4302e756a---4873655528.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hi3f6893g7cr3ci69f051squ6g/falutux.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/123cbdfafb5e822d1f2ba1eea5337265/gefepufegozuvupipolofukep.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b47789cf---zuzizu.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizosapusefovewuf.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zuwejupub.pdfIn PDF document text
    • http://unsersohn.ch/images/file/86182915412.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fab10c02---42735293213.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/76286794931.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/sejezibufifuxorodo.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/dofukovoposidevadesupevuf.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/61a087a89aac5fa877497d4bf2a71e8e/14316255559.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/48146591579.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9dd66e704d51185844ca990861c5c481/kosibojerowetiwaboxizor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=metodologia+lean+six+sigma+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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 17760 bytes
SHA-256: 8d17ced9c6f0efd5f616ae79dd75c1c620d04b2c0a00434422412f4e55fa974f
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10836 bytes
SHA-256: f2ff43040d018f8902d8f560a94b02fbebc44aa46b65e8b50e678ca5021142e3

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