Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7ea15dafde20c8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 09:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f77fa4c4bbe7d257f98393e5f5ee3a45 SHA-1: fd3404332bdb9646ff735fd85df6f910d14c1c8a SHA-256: ca7ea15dafde20c8414cd4f3e006520bd9d8bb7eacc9f177bbf64be966ff1593
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL, http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pigudegu.pdf, directly uses an IP address, indicating a likely attempt to host malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5a5d2e72cc2b27fdcf2a3e88872fc110/33191068115.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/kipawisumipanumariw.pdfIn PDF document text
    • http://szpk.hu/_user/file/3553331141.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/88042254579.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3dbd8a4e46---52005477554.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4iidub8ul8odik66mab04rap61/28612037077.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/47590303143.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/wosowonodorevexa.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/pigudegu.pdfPDF link annotation
    • https://skvacations.com/userfiles/file/rubivizetorisoxezaxaz.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/70591889197.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160989aa018359---rekudugupirilo.pdfIn PDF document text
    • http://18554080.com/userfiles/file/34970823324.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/76594151374.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///10941079238.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/73898271327.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/66065514038.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070c16b41a87---86060461550.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/gusegamisiwozonaza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559360c07a---83065411914.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/64840854236.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jiwimefodawosozatamutiviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=froggy+books+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac9a890bc11ec1acbdf1392a1b609981/57652497948.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 17444 bytes
SHA-256: 191b7e93680aeddb062f9974aecbddbfddc97a502b7b500c588186e261490d3b
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10360 bytes
SHA-256: ccd520e07ff99a0e4924771cb83988f2d2419da1975c933840e3b9f8ceaf24d8
font_02_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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