Malicious PDF — malware analysis report

Static analysis result for SHA-256 5642c8e03f179d00…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 00:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6551064d71c7ff3172a874b716b21597 SHA-1: 337bdb9b880fea43eb505f1ce3ae7322a9e381be SHA-256: 5642c8e03f179d00a65b3f6db7632971db7901231aa2e3519fc097dd1b1c3dd7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://changwontour.kr/FileData/ckfinder/files/20210911_F1D0D1BD7AC6BEE4.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/14160949380.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/52283947435.pdfIn PDF document text
    • http://lactopad.com/uploads/files/bibusexuz.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pumusuroligizot.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/morexozomosepidaxibolejo.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/39572906625.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/bojulatesa.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/179433651.pdfIn PDF document text
    • http://taociren.com/upload/file/210907055044665751usg7vn0pypi5.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3c96cb8e---tiwosimipi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/danerijoxinaxasufa.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/datesaveparak.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161470ab77d7e7---fawolez.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/99090118115.pdfIn PDF document text
    • https://kimansion.com/uploads/file/3516226039.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109081438202669.pdfIn PDF document text
    • http://afro-safari.com/upload/files/xinomafixamutujadozuvot.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32ba4da5---silawejubidupomob.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109110032214978.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55486949033.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/rinurulunumimadinupej.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/lipelexusabumutepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=forbidden+love+watch+online+freePDF 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16348 bytes
SHA-256: 80ab838269c0620a8aa10aad7976854571af9973bf5385bdc91cc3683899942f
font_02_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10676 bytes
SHA-256: c811a7e7dcd26d559c62af848eb77c7754478637572c94eabc278770414ea6d5