Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb8e91b0bb101e8…

MALICIOUS

PDF

85.2 KB Created: 2021-08-31 04:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 166e34a8e6444249d338a4dd8ad19268 SHA-1: aeb388bbfcb3c77eba3f34e6bac42c44da5ded50 SHA-256: 3bb8e91b0bb101e856942890872dc0a1fa694f3b1deb0f1cb44c3c8dfdc6da7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6602

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9db7289535c5e9f34ff157cd71c94c52/23819868646.pdf In PDF document text
    • http://starrwindow.com/clients/863399/File/jarubajatafezoguj.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/73097862291.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/abjglf7ijlhc5i5mh2js9gjcr6/24329851806.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/babibaxebapozodeju.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/wolosu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gunuwipegagi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca27fa34---kexezodugobutofagoruwarom.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/331e7d8dffacdff8d079ac496eeba0d4/benimidosegesuluxe.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zatojulozavunuxiza.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2c988fb---tisuwesibadimezuxisuwuf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cdeac0155b678788d42023e7f6800650/16872653864.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbfd72a52---zoxadinikowo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/13929962815.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/84444234011.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea22bfg31simrbsaqrv8qhbhjd/visemugurataturixugel.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/194ca270o0vula3hl1d5a4hao2/39740369251.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc505c1a6e2---zirunugo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/tikarexenipe.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/mogefun.pdfIn PDF document text
    • http://hzqzg.com/d/files/rotekesukugeribokaxagu.pdfIn PDF document text
    • http://starsunited.at/upload/files/digalurekuvixisibulinu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/82276846116.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/xagolomajal.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/37760800003.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/madodisivaduzelimaxa.pdfIn PDF document text
    • https://hoalavender.net/upload/files/bifikemagegok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=biggest+climbing+gym+in+the+worldPDF 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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 11048 bytes
SHA-256: 38f3ceefc1db0ae3c2543cd7d5e94a411249f18f336cb6efbd2c55a4e30c66a8
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 17976 bytes
SHA-256: 139d3852e7773ecfb3cb938ba7b7b4b5f1e03356bc7caa76d98e3adf6617c5b7

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