Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdf099aa631391f…

MALICIOUS

PDF

72.4 KB Created: 2021-08-31 23:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 420550261529eaefb39ffdc882942063 SHA-1: d6e4172b97665bd885b2d7b7770e7a70ffda4dd9 SHA-256: afdf099aa631391f1aa0381b1e6e76485d768088707cf47d2b22ffbc81a5e845
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d51b02bf8---1632774541.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/50450713261.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/zorimuzuvem.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc58e85e82---74270587172.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/34828360774.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/20034132897.pdfIn PDF document text
    • https://poker-fire.de/file/begilukudes.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/80098363234.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/niwavobifunezufimunaliro.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6csr5ka9scoffidbt2vp89g47s/47168271243.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3de3bdef7---gerelebinutu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gabanowu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/visaveninifamukoladigewu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jeranad.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/latitajo.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210829_5F16340C9AABDC21.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c62671b92---88159761672.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c032908a1ae---2465064899.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xenorimakozumikewitabil.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072609d71446---6876469846.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/12103711635.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f255c47d935---safalewabusi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/rewopar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+double+bed+in+minecraftPDF 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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 15400 bytes
SHA-256: 69ad84a185d1a36c6a3bbd5583a8ae6687a97a1a57135dab96f4ed50b7e4ba7a
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 10876 bytes
SHA-256: 6b2b12aa87c1e3cb6c9121c945cfed84534900a62a5dd42c4e3781644ebfb9af
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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