Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98bf61b4f61c26a…

MALICIOUS

PDF

88.5 KB Created: 2021-08-09 19:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 108ebbb121a3ed5aa20b2cd4fc01ba38 SHA-1: c69d513c33db8a234c86c14643d75e8e8cd1b4c0 SHA-256: e98bf61b4f61c26a40ffd55394cc81a5a61f76cbe9edf397849d741ec9afb1d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 http://orchid-daikanyama.com/userfiles/file/76815068412.pdf In PDF document text
    • http://toonesk.com/upload/wamalurujofofirinove.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/53799043084.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d7fe3bed---bogulixuzowul.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gomitunilapetijix.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/68380326805.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d545eb5dd---notaji.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f1c9dc074a7f0ff81242f6c35a29c8ad/lejazijelolerega.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/54071039503.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0hjjosqlcb5nvslv1k0aqgeavo/geluxekamomugizebaziwa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db86eab176---viromo.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/73918245004.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/82860226531.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/21686aaddfda373265e7d40cb9032ac1/10216158986.pdfIn PDF document text
    • http://cecev.com/stockages/files/gejuzetadanuvodinujabosu.pdfIn PDF document text
    • https://lemanssrl.it/file/66673694132.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kadobibu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f624f44---25903613153.pdfIn PDF document text
    • http://brlairport.com/images/file/44493502230.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/07535f1bc2622bc6776f4a33a9cf8d20/losenijofax.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/13201454973.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28b058bb80d5d390e972f98145fcb884/55287831137.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pepawikanaxaliwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ubah+file+pdf+ke+word+yang+bisa+di+editPDF link annotation
    • 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_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 11216 bytes
SHA-256: c512d19a1b96f005aed9865e655817aa4ca87da6f380194e8ebacf3db7ba68fc
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16996 bytes
SHA-256: a00bef68747ed01d5ad6bc2d1c0893df035f3f72114c5704085d51280d8d35a3
font_02_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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