Malicious PDF — malware analysis report

Static analysis result for SHA-256 609b764dc1747b1d…

MALICIOUS

PDF

94.2 KB Created: 2021-09-16 17:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eccd4e7395d6b2dd7635cdb0f574c7ce SHA-1: 04cf51d38e4d4561a673391c95a063b4abb1918b SHA-256: 609b764dc1747b1d87a3baf87af907f693f3f46d4cdd8764b7e56acf47e89d11
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 websites or are part of link farms designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and threat intelligence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pixomot.ru/uplcv?utm_term=land+zoning+map PDF link annotation
    • https://ptogel1.com/contents/files/94295995086.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/87340566198.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/gaxuvalafenibomenowux.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/40734273466.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137598841f46---wuweregagan.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/pobilanemema.pdfIn PDF document text
    • http://sungder.com/upload/58849264600.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/67378208889.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/74665307053.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a3f3a061---resulamujirubomagarinijix.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/10461523447.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4561fd6399006c77b527104c3e7f1d9b/73726175641.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/tavazuzijovozode.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/gudebezuzasorenixivasiri.pdfIn PDF document text
    • http://shamayachts.com/upload/file/96816339576.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/39898060727.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zolenegojew.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/dirotosapisovomumirumuzi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dad99eb---wesodoriwututefusolonorig.pdfIn PDF document text
    • http://halaljones.com/uploads/files/90404802270.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/taworafezeb.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/7052291151.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tudakivamobujirutotugopej.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdfIn PDF document text
    • 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_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 19228 bytes
SHA-256: f2f8c26fc1fe7ba00a173a1c0e9ad57866839d3a5178e49362b8b7f002b40876
font_01_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E1 10208 bytes
SHA-256: 6fb80862d3942711c41d2b612b6f250082672783a12c8dadc3739ddaeb7faffe

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