Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c79a135a89fc11…

MALICIOUS

PDF

78.1 KB Created: 2021-08-21 09:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c48ce618d4aa90477b9fd19f27a1830e SHA-1: ba658801eb510ad099583a530427237d39e088bf SHA-256: 36c79a135a89fc11593685c1eee36ed7539af1fa80d7968a8f7110b876930760
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed embedded JavaScript and a link farm pointing to numerous PDFs hosted on compromised WordPress sites. These links are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3485

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921642e050---31158982011.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607864bdb2de9---40001071674.pdfIn PDF document text
    • http://signauction.net/userfiles/file/52624923571.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/36926757321.pdfIn PDF document text
    • http://temple.mo/userfiles/file/17606067735.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/77b62b57bc9ef6eede414c5e856926a6/99162904201.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f5288df6---dekovej.pdfIn PDF document text
    • http://sun-tes.ru/files/file/92511406658.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/6085221883.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nixiradatofafije.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/karifizuxetuxisisisegav.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a62b7823---25528236917.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc513354d---tokulewudasupitosukixag.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/nefokafezebozize.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/omkioedqcgpcha4ailma8ble84/juwivit.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/70325615388.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/dexixuvitatiguvesiwuwawut.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b530cfed---forud.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a0f1319c70fc8479d23f4513c0a28055/gemipokomak.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tibafudo.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/55923814013.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202987d00c---pevolubevajevaxa.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/14856680982.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7habavi38o3gkspr4bl9fl8a2n/bunikitobutir.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf8acc596---49930570615.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f516b399e8f---91509135163.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/380544430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=amplified+bible+free+download+for+windows+7PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16308 bytes
SHA-256: c39bc355341d536bbbf96200ccacb303504e9c639fee4264530527d684f7c7ce
font_01_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 10820 bytes
SHA-256: af66346465b4931575e6ef044fadf1042bcc814ce237dd9e76257d3f0941e0c8