Malicious PDF — malware analysis report

Static analysis result for SHA-256 25219287e0840dab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 20:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2302bfae4746f14e03e030a610ca3eb SHA-1: 5d303865f382c97d66f0257b49396f05f4677efe SHA-256: 25219287e0840dab6033c01c3236dcf3d782341d669d3e8d7e86b1592b405fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or suspicious domains, likely for phishing or malware distribution. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://samarthanamparisara.org/apadmin/uploads/userfiles/files/wawopojibozizasiw.pdf In PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dad33ae66e672e57581caf31689dfa78/lojuzepokuziz.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e83931ba---33436802105.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/tadafekazovo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078b504d5ba7---17089416070.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/13663368003.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/94855672545.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/81209535998.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/potumopitizenefuzo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/zipimuxid.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/27096949303.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb0904d9f---95140174257.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/72072771680.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ac09fa3f51f3b42f2d4e41e560988ba/getexen.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5195905e---31101790581.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/zugoranekabavutubevedavow.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/587a197f5d8381367190a502c941928e/97809773947.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/suxexi.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/55797111051.pdfIn PDF document text
    • http://iltorg.ru/upload/file/14894698894.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f43ddaee7---dijexiwigimitoveje.pdfIn PDF document text
    • http://navigator-33.ru/media/file/kokovomowigaxezikef.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161346c2d783e6---bapumaresit.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16229981043182.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/19550501951.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/bufin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=honeywell+lyric+t6r+manualPDF 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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 19360 bytes
SHA-256: dcaf8c84383b5a3103500d0c7588b5d184c4545647bb4ab810f507f306b79272
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 10680 bytes
SHA-256: 111de1f34ef9a30d7dc243491c013c809447cc9695f134c99de685dda81c4508

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