Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6fe00abc5bb2e…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 18:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6394dd0ca69811bfce7c64fe52faba13 SHA-1: 60982d45ba7a96aa65010af28b3924d65c854350 SHA-256: 3bc6fe00abc5bb2e07d577f6b392d867930fbb63c1bb07a3a8ee0bc7feba9bb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

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://oniceh.ru/uplcv?utm_term=pa+motorcycle+manual+pdf PDF link annotation
    • https://beauty-full.ru/uploads/files/66443236740.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/baluru.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e443026a4d6---bavabal.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1fc0c8209---wunazupovijelitiwitita.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/mabubaki.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/71395091499.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44d16c4db---23021405131.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/fibakiveru.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/funawewim.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/remipelaw.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/vaxexunigi.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pezomulekozagirufubi.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/jagirasetazofutunud.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/10694524927.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1i0pvlb2btfd7q5grctqiqqn35/rilime.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/15974937337.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/65697367041.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/pegugebuliburevetabu.pdfIn PDF document text
    • http://elpijisystem.com/file/58362337725.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/14f906b23f581a72ce075eca4c736a05/paziwatarobefupogamino.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a22c49c118---76292165864.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/11657261016.pdfIn PDF document text
    • https://proxus.nl/file/89924731942.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/31196437181.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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10736 bytes
SHA-256: 50ca7ea70c0b66a23aa98e4cf70e4be4ece31aba3a694c3e945c6f5dcb21f58a

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