Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb58f801623dd6b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 01:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ace7086e6c268f858d2aeab3be1c224a SHA-1: a07021f575a3a866ce42f5de6678975de588f27f SHA-256: edb58f801623dd6b8796576e01ad75e0cbf9713ed12a0c8b5f71bc1bc2482c7f
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly implies an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7998

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=savage+barrel+nut+wrench PDF link annotation
    • http://stringquartet.biz/web/images/fck/file/busajabojezet.pdfIn PDF document text
    • http://nemochem.cn/upload/files/josasobutavev.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160764537937ed---matafenalowulerezat.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/notejadofakul.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/danel1hm7at1busdabmuloka49/nowodidogeragoxup.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bb9997c5c8a3cf3c5365af13ef89654f/49764554815.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf0e40128f---39609572369.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/jikidixegaje.pdfIn PDF document text
    • https://badrivishal.com/media/13118019794.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/ridulujor.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/76596672937.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9aabc06ef6e48b0b5d9969d0ad2b87db/gupibuzijaropafaxusalok.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/1pjb69uo9gqv7u0qirqcqgo835/57622386304.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e0da82ee---fepilapuvojitokowavux.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a6f97b54ccad3443d7774a25e5a0c293/zagojuxaworafowajorem.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/banipipaxuvonuke.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/dekulidilag.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610430c33924d---16856295451.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/7374962204.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/savufigapefuvugemobifabop.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60df6e4b7---dolumudexopu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/wikasasamadaginurelusi.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/79724225226.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f520938cf---78042785853.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/23818041570.pdfIn PDF document text
    • 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_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 19020 bytes
SHA-256: 246a903fdf0ec1fefa51db8d0ce7f0c83f76f9cf520f9a7c357ca87cb4420cd4

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