Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec040a8d53e1624a…

MALICIOUS

PDF

103.6 KB Created: 2021-06-18 18:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3a7807acda64790d8f3f448ebc6f4949 SHA-1: 0279651ffa19fd866d7dfcd1de3f150717ed0454 SHA-256: ec040a8d53e1624a49525ecc48e7c9edc52dfadafacfda202a4238730c83ebe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document's content and structure suggest it functions as a link farm, attempting to direct users to potentially malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://drafthe.ru/uplcv?utm_term=paradise+lost+as+an+epic+poem+pdf PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ced8c680a4ad4ea9ef55e68da846c37c/rafojagotusaveb.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d465b6202---wakuridabelopajebumevo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073efc98f2c7---nerexogu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zabewa.pdfIn PDF document text
    • https://hgb.se/filer/file/sofodavotubekaterex.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a2481aa0578df841db46479354dfedb/55503077683.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e176626e033fa40f805921a754a828e/fotatunidexatisozuj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52413dfb0---23460809554.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/64216881786.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f68bebed---xodoziwote.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/74af61153973d31536911ce425fba240/mivunefabibologu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wonefovenuwelaxolexifid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ef4540ae---wevub.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0766327acaae836504236476384bcd3a/xinovawagirorodig.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/f13glf241stvkpb1e5lf4plhh5/fapawuxanowemaxagumikusun.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f329f948---8502338551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AF 5300 bytes
SHA-256: c7cbb4da5bf7bd1ed0d7a257dba2b6c062cae579bd28186ca8fa4cd22b07049d
font_01_sfnt_off00016aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA2 11708 bytes
SHA-256: 2d523d1a3733474360e066460c5204b93e9e1ffa3f6059429ddaa90561a561c1