Malicious PDF — malware analysis report

Static analysis result for SHA-256 d459a9b831d32a8c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 15:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58f120774a59950a88f3b2708836db42 SHA-1: 91fb56670db7b058d0438b7efd5b7b02084aeda3 SHA-256: d459a9b831d32a8ca4b5484e3dacf6c6b4308eacdf1d95a2e5065bb99e611ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern, with URLs like 'https://catamma.ru/uplcv?utm_term=yts+to+download+yts+movies' likely serving as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=yts+to+download+yts+movies PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bdcbf686---54022123222.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109021752204311.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/79605638228.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_7110B375A2A187C2.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/giwodugu.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jijevepowenuwebo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/8358362818.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/89617741535.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ce329111658b63720cf8fd2ef0bb4f5/75241808005.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fb833dfda10bf6337ecc53518b807b03/11302309230.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/zapepefukukisiki.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rarewisijufabanixof.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/94136601504.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/68484209043.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/73881843650.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/silegowitizibawa.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/61974747949.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/33938133135.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/9840238646.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137898ebb17e---54832207955.pdfIn PDF document text
    • https://senfina.top/uploads/files/raxidalo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/runuz.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/790505811.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/rufabikuj.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 10560 bytes
SHA-256: a7de65ce646685d03a6c6863bc28917826b91625fd57571db1272373cf70528c
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17808 bytes
SHA-256: aea88def9eb35f3812ac3f2e63d36b0035d9af728185807f3b8d8942c08bf5ce
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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