Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e20452e63f10bac…

MALICIOUS

PDF

88.3 KB Created: 2021-07-05 14:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 476c78c5febfbab1db2a36cf2b965bb6 SHA-1: 2f3435ac56799f45a6c5567cc018768478280221 SHA-256: 4e20452e63f10bac120324f2a03a5a860e748e89c5abd4a17810313529bea18e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/xewaxabol.pdf In PDF document text
    • http://hublihorse.com/uploads/userfiles/files/93865503392.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821d13336d0---21724887005.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zokuzuzosen.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ic83kk5pj4fh4ah9mnl0hc4dqb/weladugavorawekurozejox.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e92a80e7371cb57335dd411d48f3a53b/runofakumajelijotabasafut.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ta250hrm55kipd5neiqv0r6gg1/96694739597.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210626035503.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/zuluxujiguvusafu.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/dupanofuluxub.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4a709c2fd4c69aa89cbf6d28784205e1/tivajixigujoriw.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/xifidiwoxurapefebixeva.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabb088334---xidevisebe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wezemunasi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b957e47427b---90027501748.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607273db26fb6---93199157053.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/26176814269.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/41174559707.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/nabogafalu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/aab8ff9af7d3b227db908aafeaa7a7de/33114740452.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/28956226986.pdfIn PDF document text
    • http://royalgroup.at/tmp/8994463481.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5ecc152a---56754773469.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f8708a0c9---78846787914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=andy+griffith+show+jack+nicholsonPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 17148 bytes
SHA-256: bc5de9291651dd6bc3566dfc3c028dc6d73b4e190a1bbec83f81eae24d1bcf40
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 11028 bytes
SHA-256: 3fc37520dc6f0c2df8b69ff78c9f316ae1b01128b9acabede13ee98a7b3adc2b

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