Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6b69663dc1b3a…

MALICIOUS

PDF

82.0 KB Created: 2021-07-08 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a8ed481b90235e6cfb9340307a63d02 SHA-1: 2afd96c3ab17d5dd6b8d9fa6736bdb52af490721 SHA-256: a4c6b69663dc1b3aed2c09adc1e833313fb98800a3b8daa3578e366e05c96656
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These secondary PDFs are likely part of a phishing or malware distribution chain, aiming to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fa6e8540686ab5ee8246b6e48a15d15a/56525303044.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/18306791359.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5063b23f0---darutosaxiluwuxerajinupe.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/17074726764.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd223245ec---58696656241.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/56110926688.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/6321888913.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffed9a4bd---rilugu.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/67474086818.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11021060055.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d591edc3a10f53cbeae21ff72b1dc8c7/dovukakuzusevasagavir.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45237307647.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/da7aac7269e88ee3f0d314195311f405/44417871557.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/31456668090.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ccda6264---49169395061.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c67915dcc4a---21208804382.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7d91eea9904041f6aa4009ed24636528/gaxuvopirerilo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd610e607---diligunovasipuwinotugod.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/54000252539.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/51027321312.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/96673580774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=planning+in+managerial+accountingPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3c8ac68307a15759b71d82d4e11fb30e/7922681924.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 16184 bytes
SHA-256: c1a3e6a69670bd3f675462cc125290753ed62062597c03b6c80396d56bc28ffa
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 10504 bytes
SHA-256: 35c7c5ebb783e269d8aebd44937cc5f5cb84d0e94d6cb51fef3c37e378266d08
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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