Malicious PDF — malware analysis report

Static analysis result for SHA-256 cada5ee4e412394a…

MALICIOUS

PDF

85.5 KB Created: 2021-08-09 01:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d811c049227db37dd95713ca30957fb SHA-1: a0145a565a44b1bf0c6a700ba0e38b30ce6e240a SHA-256: cada5ee4e412394aea800f41ac7c4c8fa8b5757964bcd94a879834d4f0481249
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://philabc.ru/uplcv?utm_term=what+is+bronfenbrenner%27s+theory PDF link annotation
    • https://gulfb2b.com/userfiles/file/kagaverodo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hs37mf0uu41dqf9neeml9o2ch3/gimebixilugibanisi.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/301307124941.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160830bce62538---97374779577.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c6c9d4ba2f7f811f48c1352b3f542f53/xidukepegisatesegof.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vitoramigiruwasuliwijul.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/eb6770fd2ab43c4722bbcd4fdf45a08c/34811028999.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/21735964604.pdfIn PDF document text
    • http://teraval.cz/res/file/83419437483.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857de2d5f88---27813499753.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2ae9615ed6d9c6d231f1a7887b5ee1c6/raxed.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/75905248303.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/mizujuwuvebevarid.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0114b6c69264235ebad092ba5e2ea8a5/41177229867.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/468rr6otpoub70k2204miuukt7/88501074636.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b86f7ad3e0---velun.pdfIn PDF document text
    • http://sns.hu/_user/file/77505726430.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/84341823915.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l9edbs8g9jomhbmnm76du4qimr/76419530245.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/41627035492.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd49592b47---2567656248.pdfIn PDF document text
    • https://ivaco.it/file/garomavoxivalakoka.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_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10548 bytes
SHA-256: ad43d64f4e5e6afedf8fee3bfc2c2b478b8a181aa0b1f3fa6fa00b03399c0bef
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16644 bytes
SHA-256: 9dd0b7b14643ac292ffeeb82711d7a0ba2741cb85c3e538e2f06a52865759c32
font_02_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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