Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852055c5536026c…

MALICIOUS

PDF

62.3 KB Created: 2021-09-03 09:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfff1549fe3c2eedff8fb1bc31484ef4 SHA-1: cb78871f075b6da8c3dc646715d98ce02ca2c6e3 SHA-256: c852055c5536026c21464eb854c17d49f128acde819da26b6f0c385d0b9edb13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. The presence of numerous links on disposable hosting and compromised CMS uploads suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7000

Heuristics 5

  • 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
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db106c0a07---44399971762.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a506b9618---batuzutefizitomezufefa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f68c6d99---58098151741.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2rjh5m9tnhs5q5ve5a2gj8o1be/91724604102.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/52694761802.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb0ecfa27---kowivadazasebeziditi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f987bdd9---790647828.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zabimoga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980f3b8a81---fiwemuwuse.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lqjuvnbahpbgt2joujp74tubs4/tibiduzoperepa.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/njruf9fckuggjqmn4uf4se3iv5/pudirudusijuzoruwoxo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612991889724d---42521191745.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28568139956.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/kaguta.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-15/images/files/jufibuve.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b845ff1070e---guxagalaxaxubonosa.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f655fc32afe08b668c209cd7f0100953/26714819911.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/59553812012.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1228b4375f---tibaluwilojarevokalibimaj.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/37247647977.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/27247002438.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/gudatoxala.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fizexekakomibabipevofan.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/55200347661.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a64c0f842---xibudavutipu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac649a22559---jupinejezavejologutupanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tipos+de+sujeito+exerc%C3%ADcios+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 10656 bytes
SHA-256: 757d7e0cdd7866b1144f6f8f780abacc228ed676d190f794fa91c1e835b9aed1