Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fae62f6b2d2a54…

MALICIOUS

PDF

69.4 KB Created: 2021-06-09 06:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ab14356510a418e351cf157702edc35 SHA-1: 8430a1681c629b8d95c6c2772df21b5f13a3084c SHA-256: 54fae62f6b2d2a5428be9a94cd51cd756c66757be9bdac761e513d077edef04f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://ketchas.ru/uplcv?utm_term=future+value+compounded+monthly+formula PDF link annotation
    • http://banhangcongnghe.com/upload/FCK/file/25943870867.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kajititekifazatixe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/darddc3fkr6oq1cbgos43t0ae5/kufibunigazogani.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9ed4351c---telajanerevaminunubujoxop.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e11d85d15---63904416746.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bulitigogikoguketef.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789631e4489---mugura.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608347e28a7fb---80600897003.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/mijawijog.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fuzirarelokiga.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a2b0897d50ac31cd1a1e44704f6571a6/71912261626.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/doxebadutikiwexapoted.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/615048130609006740754e.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/30497437535.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba8d6099---25977460348.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7c99451d---84341780925.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 5332 bytes
SHA-256: aa3e53ffd6be4ba57e583c5716359a1500c636b6f1ea9c640abb88b4c72803d4
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 11380 bytes
SHA-256: 29345db1298ddf59763d2fbeaeb15a4f66355fb73cde8da4087c339bda75afed

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