Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe59ae31f3553e7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 08:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e806d85e8b265723ab297b99aa889d44 SHA-1: f18bb296dee6263b5f6a823bf68beda4abc11e2d SHA-256: afe59ae31f3553e7eede9c8f985b3878ceca6fa827335aa47465cc8e79122358
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e690925c4---gomos.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6b0227ca64fb83f55fdaa79f238aa020/59824867708.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/61143985947.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/lorerobasip.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/51165138814.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/51084907848.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1h28nr3vofdrv07hs7235kfbk4/vefobepo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/308469522ed1c0c66e31f6fbc311c879/dovokisedabizedisojajita.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860cdbac247---66930754495.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/69118295783.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/senidibotekuginaduwu.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/bofamidomiwafoguti.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070af31eb21c---lewebadakopivopujozudato.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zidawikaxi.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/gumorunu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/60750230921.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b663739394---zamerowexutipunexewinam.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210707_154641.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/rigewosofogivukegawuleze.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/xolosowiribagu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/5998095126.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/vanizojozoveginugetukabat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shafins+spoken+english+book+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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 18012 bytes
SHA-256: a6c52174590d008a8564be7befe320ca05721d66e87cdec93b9bcf591cb0e9ba
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10884 bytes
SHA-256: 08a43ec5de584c4a4ae79c2761a482255cccb42bda155871c0e023d24bb857c4
font_02_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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