Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51a16e92830189d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 07:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 738809041fdb760dede7942a2dbceeeb SHA-1: bd9e752b239cae7fd87e5230e75c90bf9abd1b66 SHA-256: b51a16e92830189d93a1832014cf84ab7cde2371927e8d3ff5d1a56712b26627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or content-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://goraku-sangyo.com/userfiles/file/sobegabunamop.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e91e33fb09013b8ae0101b579bd043a/14283463846.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6d8c200be650738df8871043ac1d990f/55714348773.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/fibugivexutitorima.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/sduc0aq5gtku405m537v8ie1m1/70881882015.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/letevuxizazigani.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842210d1b9---13021538565.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0fca871ab---ruzawuta.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/tivopepimikitutizusexalup.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/kunavivekubijot.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/494umg1lfr270m6lacvgdvo4r6/40081396681.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607302d940a26---liwafatem.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2dec50f4daa74c7b9ab98ec76ba2a8d4/rutunedivowo.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/85580171611.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/43828990607.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/201433dd72f928d38b1cc9b7d79f67a4/pifuzi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/30595355094.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddab32aca68---65226131434.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609adec26f472---52849840120.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nusoxutolikololomenoregik.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kejofanufab.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/waxulegizibife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=property+management+agreement+template+freePDF link annotation
    • 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_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10556 bytes
SHA-256: 848e53cf5afdccda2d6a0e5be16f7f99dc375bb051bc5d924f3bfd2724a22a38
font_01_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 17164 bytes
SHA-256: f075089d5ca56bb2dea5684015096ed988ce204aad212d8b7743dd1f0a4df55d
font_02_sfnt_off0001407e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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