Malicious PDF — malware analysis report

Static analysis result for SHA-256 566fe62949f6b00f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c49f4c072a03835db3293983c0abc071 SHA-1: 94fc97b1a37d76d519a3e67b494505ce380c3c2b SHA-256: 566fe62949f6b00f44a8641843f21a1801ad12b38c1d604a6ead63df5938fc5e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to potentially compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not form a coherent narrative in the document body, which appears to be largely unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aihr-iadh.org/uploads/FCK_files/file/16568078510.pdf In PDF document text
    • http://epodhajska.eu/UserFiles/File/48387486910.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/joxiporup.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614197e809145---kajadosejerejoziwivemuza.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210913230058129855.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2f916bafb103c48b53e3bfd73f58336b/76915654108.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/77653647189.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/pepemi.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulifuwoza.pdfIn PDF document text
    • http://speckrepej.com/upload/file/loxarawog.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/xekigegukoxubovefanaxuti.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/vurolijiwosozeram.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/bifawapefepuruwadebofel.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/94de48dba74fde8c57fb97bd6cf56359/pujananunamibetod.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/67117245550.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/lukosowikovekolulixegolun.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/20923760059.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/72885616435.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/luwuniribolegakixekib.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/votogo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/fimerowo.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/95509690662.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/pakufup.pdfIn PDF document text
    • http://poultech.net/d/files/futezotamuvinogexemumuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=murderous+pursuits+iosPDF 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_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 18256 bytes
SHA-256: e22af1ce0b2d8e40d0f6687657eced60734e2137cb00dad0e9d5345eacf8de2b
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10168 bytes
SHA-256: 1cb4750c1937cdfc5475f825e97a8a83b89357ff717505e10087b36c2f367f9e
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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