Malicious PDF — malware analysis report

Static analysis result for SHA-256 253a38579cdb7b7b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 10:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53954089d6c39d36055f2e25970d39e2 SHA-1: 6b9289b1c86785a44ac7db9d5829923edb96fb9e SHA-256: 253a38579cdb7b7be36fe08e82d95f732b4348aeb28422bbea24528a43c2cf8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF's structure and the nature of the embedded links indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://originalavto.ru/userfiles/file/29252209456.pdf In PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/42790441186.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/83702870741.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/92805331106.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075aff442a64---66072350495.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a7d4f595---26921790289.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/k6fj47q9is9ltjcq95c440og97/pisepeke.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f0a612mheeqro120q5g1ccv3f5/xumojodaj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ce0e2d9b---40686004345.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86939639109.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/5429266206.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dafed858a36e9329ced99bfbe7b99cb/15666651624.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e460d7e8---1626135105.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdfIn PDF document text
    • http://aweibel.com/Photo/file/5854431686.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/68866903934.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pilokekibol.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd465b5342e---xiketetejasipogiwavoxu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715283824ae---lejitifesetukosiga.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/dugotovufiwat.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d69f43ced---299402164.pdfIn PDF document text
    • https://birotex.rs/images/files/26546709770.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eo1gffvk1176uqme7sgsltdqu3/36861535496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=antecedentes+de+la+contabilidad+gubernamental+en+mexico+pdfPDF 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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 18412 bytes
SHA-256: 9189f22f6fd9cc87c7b6ebe6f2e3edad08d87213e6b2fc3e8c56e07fcd925bdf
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 11284 bytes
SHA-256: fa048271b3bf946d2ec1aa858b1d8d7f70cba55e3a309ac87e2198968b9cc218
font_02_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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