Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b54d30c68048d86…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 07:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8261751963602952f3c1cdb169fd140 SHA-1: cf88fbfdd0334d85044258b736d2b88db6981874 SHA-256: 5b54d30c68048d8602f5b31117f27bc2b0db7a1a041d0e5915414f546911b9fc
156 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, and exhibits characteristics of a PDF link farm. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cke.hk/userfiles/61704519450.pdf In PDF document text
    • http://eatatrudy.com/uploads/files/90947788655.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613078e64ecab---suturapukasizagijenozolel.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/58424918947.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/tagudawujaxijev.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7026889f6cb3b6829f083a09d7d76a5b/85517204782.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/dinalesolanigugapovutirul.pdfIn PDF document text
    • http://labsshop.com/d/files/zazab.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/73768696327.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/45715939374.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nofepejidemubap.pdfIn PDF document text
    • http://cmtsport.com/pliki/fofujozam.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vibaweganarivaziw.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/49970909343.pdfIn PDF document text
    • http://rld-carbon.com/file/vebagavovulidefon.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/lowejafuxuxogatumavut.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pojuvo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00a8b876---wugazoxuduzawatepewo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/62280400133.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/76395016702.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/80794685642.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/44461634301.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/linapepotumalovuki.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51f24fa9---16758977359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=music+player+android+chromecastPDF 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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10984 bytes
SHA-256: a08965ded202578b40b1e8f8252121ada81c746570a66f41f54b5863ae7d5ab8
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 17308 bytes
SHA-256: 58d380925f459d0865ed85eb2591dfea9ca3178bf4a75abebc790d4bfb631e00

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