Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e9547ac45a7c7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 21:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5089fe5418ffb5de6e6a6589f2416aa9 SHA-1: 8229b475bafe3dbc45261bfb2ddec491e76265dd SHA-256: 131e9547ac45a7c7034211451f009e13b913bd71267dee62564e60cb0550f466
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs are a primary indicator of malicious intent, likely leading to further malware delivery or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://auldskoolrocks.com/clients/878384/File/viputu.pdf In PDF document text
    • http://harchovyk.com/userfiles/file/pumozemubuxixasorifa.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zapasurezazogiluvapamilu.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/6734003298.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/juvusijinixepagesur.pdfIn PDF document text
    • http://recrute.fr/files/files/goluridoxube.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/mokosefujatalen.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6ec5d8a6c12943089861d52f834f5a60/zojolavufefonezopuzejim.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/40166040571.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/zibizowiduribipojolafis.pdfIn PDF document text
    • https://areicon.com/images/file/77991997412.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/niwizawatile.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/limiwabiponiwimusademexi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc70217e56---51853647719.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/kakefel.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bed2fbecea64c869a6ebb719abc11f24/bojonamuge.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/50103233931.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/48817042010.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f6fab6910b64fd2de04be6c4ca537a0/vumotemabavijozaxumuvizuw.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/41387893590.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/kinot.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072e584ee982---45675986085.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca24476b80---zozapenogefojixozitofib.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/682f28fd1f59477ee508d84dad885e44/89934565775.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/suluzajoniboxa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/381b46a06ab1f6c4b4912df718ab0645/rirugavetafeladu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=diur%C3%A9ticos+tiaz%C3%ADdicos+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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 10708 bytes
SHA-256: 793eb4868978abc929195bb40070371fe251f3cd9f3933cefddb69d5be26a5df
font_02_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 15784 bytes
SHA-256: 40344c1dae0b727d9d898aa870bbf3ff7e2f3db604b9fa2277ad809504f1b3cd

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