Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12a8a61dec384af…

MALICIOUS

PDF

72.7 KB Created: 2021-06-20 08:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3150caa9311c43b16ad9737e49ff998b SHA-1: 0c60b719c147f4f6ae1f04e87ce115b30c420788 SHA-256: e12a8a61dec384af2c8076fac094417ef029c84cced187ba4d290fdf3bba215f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=history+icse+class+10+solutions PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/icqor8q74248g529nv53vqarqc/64955978638.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd31217db5---gepegevun.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/budixurimapa.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/susapamavowonozifalasedo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46506d14d---fubilepuvelofak.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/vizodilevaxedojefoguwot.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nreho7hm2n42go3l8bb5mo1qa0/88087724109.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f4bb868bb7da3ee7fc5f23cfd21dcc77/vowiwudepabu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e38a92dcf0bab7a91980f4e5349b625c/38496082931.pdfIn PDF document text
    • http://synowka.pl/galeria/file/nifisekazuje.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v5786lak9178ol7f2itqe12933/zodezibopenamubatowuki.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/salapikuka.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2809343bc---wisujoniredefobudoko.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43226db51e---93632035278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 5052 bytes
SHA-256: cb775da76ccbbf199f9226e5c0f74a96fe747dd92c81ed2f80b757f876f50c0e
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 10208 bytes
SHA-256: 698b571e61045c0548917cfa7b52bd02858f037be3cb84d4811e685fc40933ff
font_02_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 3656 bytes
SHA-256: 00c8a05a7ff286b705e81a5163f65fd5a1fc9e5187d472a3fb64cc7a1e211191

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