Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b72ced6a7c5260…

MALICIOUS

PDF

67.2 KB Created: 2021-06-08 01:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea34fab7a7c42d6e05ea2d57521c3898 SHA-1: 129473db1e4b1d85d5e4047b34e089d90ad4d753 SHA-256: c2b72ced6a7c5260bc119524d73d19fda990d5ea031c77386529ff7f6169b3a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://cructi.ru/uplcv?utm_term=shimano+altus+c10+adjustment
    • http://lapenya.cat/imgjovesnaves/file/84945248286.pdf
    • https://mytopics.it/uploads/file/binexin.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b3d436c64727c9bb1167459f6b4b1701/nogawupovewikigumezamuvon.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b1ba4019---pepulapiferajepunokelovet.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3f43702c3e0408bd3ff3246d90b20880/53389529010.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f541909e817e290bede470aca79a43e6/79500767342.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59d2229d7---56175456218.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f8cbcaceb912253fb1cccdd43662e99b/25016891060.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ivtgf1f42kequamkrmt1ln03c6/10571508534.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b3821c07d7cd9ddccf1ba0926f8f7327/80005978096.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/tigogutepamugagax.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985519dbcf---fepuxupuwuvul.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608351a0b83cc---39632192305.pdf
    • https://ancoraeducacion.com/images/wepowezal.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6622a3009---15016854507.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/494fe888d698a73017ca3dcaa1a96ceb/gawepiwovixufigivoseva.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35ba6ef1a---nufoxopafulujakofuwa.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3a8492bad9857a0d6da9f3a412868590/61619036959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd9.bin
7382feecf67f1d5361349206613ebd0af721c0375abafd26b6b1307545699db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 5456 bytes
font_01_sfnt_off0000de40.bin
2e0f7b8aa41c69e41744c30705e0746a1f55f14829d93d0131193c9eac77dceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 9908 bytes

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