Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5995eef5b82db0b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 02:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 660656dde9553dac688c6ba922b7fcaf SHA-1: d2d61ec1485ee22f46169d08d4a641475599a8b6 SHA-256: d5995eef5b82db0b91c4fdefa6c2b1df79d25c4ba530fd6be15bda8f46411008
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised domains and link farms suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc37b034---64910960050.pdf In PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/dekipakulo.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/lejazenisekab.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/8114678083.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/mavetigesalagotevapeker.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/27943379108.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/13243388954.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfdc55f00---sipojojug.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/sagerowaga.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/bawixapajodivabipeditimo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f2466ba4---412616869.pdfIn PDF document text
    • https://phuquiland.com/upload/files/pikewakanakijokokegaju.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/41969737630.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/ximupexefig.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613717db1b9ab---giwizimes.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bufopajefonefogedesi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wenopipodixubew.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/febujuw.pdfIn PDF document text
    • https://renault-service.com/userfiles/duranuxodewumu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8212ad7c2fb0cb62079a88296dad6cf7/81824625736.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vujuritufutupapivakirijuv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d5a06b71---diriwijamidu.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/popitobivefolipojamazus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=samsung+kies+cafe+apkPDF 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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 10724 bytes
SHA-256: da97ea2d95ab6b61e4b05aebdeb1a9dfc0fccaec27b4c64d8e020737dbeea628
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 18148 bytes
SHA-256: e661cbaa6fabff8bab9cd49f47f2a6c1356d196234966358961020f81fdfd1d0

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