Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b69be0702c1890…

MALICIOUS

PDF

86.2 KB Created: 2021-07-26 04:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd57ca198401b54bdf6fcff8ca518d5f SHA-1: 0be3aeab703400b863a566c3bc984a9232366360 SHA-256: e2b69be0702c189068f62f6af347a13294593ca9e68c6e10c108d97b402ecb36
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gramercygrand.ru/files/file/jizawumokupol.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/forujejodajan.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/vifuvovugexotewagot.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/risipanenaz.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c591f2b6fc29850f11c364709bd416c1/17126077849.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af1b72f44d---lexotakegozosefaxi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e90a533a9---79527906127.pdfIn PDF document text
    • https://majubesar.com/contents//files/nubinedulalaxabosu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1fcdf28e---laxazegetapas.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bfbd991565b9e986b6da1eb8293e7cca/pigetepabefir.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/43754223888.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fe3ebd3b501dfc26f9621a65a85b43f3/73772165301.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87610852584.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b286b49fa11---78435493573.pdfIn PDF document text
    • https://birudongker.com/contents//files/14070346254.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15b3c06ae---85687967470.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21f97fecc---pirefupabuzusikuxobotefa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b4ac8cc4---sidofanuge.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/9f0afbe9acc8177db33797fe84d0e53d/20611505220.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xusur.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/1316954637.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/talunigavaru.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9e6cf53f48e31c0824dc52160636f42/paroko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dictado+de+oraciones+sexto+primariaPDF 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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 18208 bytes
SHA-256: 30f0d317e2e7da4eda984d66297129ac7a4a99d7a4c47b524a7e9e0742492162
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10732 bytes
SHA-256: 4c94df9350103428019cc9966d323438285c2d5a2669c60986fdbe2796396bb2

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