Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc629a0d41e9dc8…

MALICIOUS

PDF

80.4 KB Created: 2021-06-27 23:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b20041106d5383a04110fc5651b2db57 SHA-1: 7ab74e588ad297365816deac5b6235d7b5d3569a SHA-256: 3bc629a0d41e9dc8992c4aea33fd6aa409412c18e6ccb09fa6ebaede43f00c95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6318

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 http://ledseoul.com/userData/board/file/pikosomazaleku.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d5e5ef37d31c8eb9c425f213b08c811a/figuk.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebc6c3767---96205347324.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/dipapolakivup.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m3vi98osr1571e1gc7v77c43e7/45992024127.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ddf2b3ad1240424f0823086388942b49/4529638249.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/60206960180.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/sogajopuxeb.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gekitod.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e7656cfd---54212905888.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/78560849571.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac814f3beec---25888730074.pdfIn PDF document text
    • https://isosklo.cz./uploads/88900000067.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3c0d88db7---333047299.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510184543303981830.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a29d912fdf27854101745c1f6c397c81/67203977248.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160768b52583b2---pikuditilafofabisodigowi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1222mllrm7gsk2r31d5ce6u5r7/rumakekazanukupakaramil.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/patewexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lab+report+introduction+examplePDF 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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16552 bytes
SHA-256: e9714cb9ee53ec2673b74c7ad92c3a10498cb85013d8867016fcf340383f3ca0
font_01_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 10808 bytes
SHA-256: 6d0fa44d0efa9b01d61078c88ce5dbdcff4c7ea545d4053f7f3c1538d21fc625

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