Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c50ff61fea7d7bd…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 20:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d976161d72a15cedb772944d38264195 SHA-1: a60ac5eadab3cb384d49d5a81b3da2fb78299616 SHA-256: 0c50ff61fea7d7bd6d8dee353b0aae7834ae8e5e9ec04acfc67f4e3d79d35de7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the 'super-forms' plugin. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/iltqkg84vci840cfbnvi8q4iio/97499605054.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/dejugozaxunipelan.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2fa94360ddbbfd1eab7c340c5ffb7dcf/88375358925.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/mimaraxidosufaj.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/44931414440.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/95488949347.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0aa71a23a0b52ccbe935c9d7c5a7e076/49628438516.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ljhpffi4a4aq999qevg7iuvqd6/91989244687.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/11265835972.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/jamavozaxikawowiligutidu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/94737313090.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vasavavejutagoxusukijot.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad96fcb6ee---lifoxuzafif.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/makefuxupaxazidinoruvam.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/45977166280.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210623_A8747DCACBCAC522.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108290342256839.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/goxefiwubuzimazevugojud.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1vbb0ankbuhsi4s1l7h1iofv7k/78722207070.pdfIn PDF document text
    • http://hrudolf.com/userfiles/77954294989.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fee45a72c---rifixorexisibarodina.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mizeravemanunusuki.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3bdad2336f705208174bfde36fdc7aa2/lozesowa.pdfIn PDF document text
    • https://mavibusiness.it/file/titavusabumuwekojifot.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b7ce2f9e---73036053217.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/59926154032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pennisetum+polystachion+pdfPDF 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_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 11000 bytes
SHA-256: b227b210e1095ed71d549ae495b30a23f1dda2d7870ec142c454d52f3d2027e5
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 18080 bytes
SHA-256: c2e1410663ebb60156bb81b3b7251404491b75153988f17d5b9477fcabe41946
font_02_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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