Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ff004932568f00…

MALICIOUS

PDF

72.5 KB Created: 2021-05-18 23:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9273bae88ad3690f08a0aa3b26b056a8 SHA-1: 337d9a83f27903cced746c8ee8b4144c82020ed0 SHA-256: 17ff004932568f00057374c99d23744aad461e740f8016d6ec4a66f04e76e3fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The document's content, though appearing educational, is a lure to encourage users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8938

Heuristics 5

  • 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
  • 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=planeaciones+telesecundaria+segundo+grado+nuevo+modelo+educativo+gratis PDF link annotation
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc0746ca2---vagelukefap.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/72472578390.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7ea7a05d---xazebami.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a468b03a7---nipinizifusinigivigara.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/wusexokarawidoju.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9d152391552a3ea57bb084acc033417c/20609484883.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/felovebozej.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/33up8a5lrfi6jq5n20co03dqh4/segopexamanurapuxe.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/mekavafenaduna.pdfIn PDF document text
    • http://adveotec.com/img/file/japatopikeneref.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wusalin.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbed6f37cc---88071369249.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/funodepitodepepusixa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fc5550557a8c14f34ca47cf8cd5c1241/94441646261.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806444afdc1---jufebubozesowuwapobasuj.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608add4916eba---88028828371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 5320 bytes
SHA-256: 40f1ae66ffa61a1315518e0e3cec92d5f188dbe0c2ce5f9b02189840d95fa030

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