Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c86c86ae46c0f6…

MALICIOUS

PDF

65.1 KB Created: 2021-09-06 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfa4f0654707830f8112cf98712c93fb SHA-1: 40dfda824a45c9b5eb15797122e16becc540e0f0 SHA-256: 72c86c86ae46c0f67c4f8a860b0a88f4b2f9bf985d514bc666dcdfdc722a8744
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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://sten.kr/club/data/userfiles/file/20210809224151.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ef500eae88722f50ecb3366c95678ebe/govesilev.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553d92beb0---xelilok.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccc053bdf---15039683444.pdfIn PDF document text
    • http://quaint-house.com/54253502653.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/glr4c4bobcf1l4gu8b19qbdak8/13315380237.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/52463300709.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6c91be8cb04252000de56e46f8c9ebbe/12510273670.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/tagafux.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8dd9cccec5d413eacd28b9e48d16eb32/22154018324.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/61008244968.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede03a3ed13---zivenexogitezabuluruw.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/moxefepigalogeroweposa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b40513db---97886744330.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a954a9d6cb4---48218878127.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/ninatetejabiwula.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/ziwovusozopejebixasude.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b0c41e5.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/rurowomujivevudifi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160828e8b320fa---wezifudadagojefaxopij.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/82254001486.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/78396171230.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/wujonadaxavuwimipoxado.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/30b03e180981d939439ced8571fa5219/95642325608.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/roguvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quantitative+methods+for+management+notes+pdfPDF 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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 11124 bytes
SHA-256: 89ef1f836213cd5582377fe63535dbeae2a48274646dbdff6cfb26642433b39c
font_01_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1