Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fa06f8e9a5dec6…

MALICIOUS

PDF

77.6 KB Created: 2021-08-12 14:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b23ed74ef97813b408ebf49b56d975 SHA-1: bc199a2984be981f5c9cb4b6772e94e21dca96a8 SHA-256: 41fa06f8e9a5dec64121d12355ca34fb892d9a1ed09f6060f93f48779e532381
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed that the PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. The presence of numerous unknown URLs suggests a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3885

Heuristics 5

  • 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
  • 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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/60908fb801746814efa9bdea893de999/93105692327.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3ff5261e05c8dee38133e49b7beff179/76396238873.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/39750964639.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/32799398193.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/pugewizedonezijo.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/furikegarijageratuxe.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071916023776.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/raxazibepakatebabaze.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vizananojezimekinegudifu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/1409602671.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/ribanufumiguzifepobadak.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/43985514198.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033df3eb181---23074335325.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/26040896032.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/532627b424383192c2457ea9b57d6692/nupozonodobawanifigabixig.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/baxinutupapofopixamovaw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ad507b15---16551194972.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000aaecc04---zobav.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebab5d52a2---kapotalibafinegusewuzete.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b291f7c3ca901ff31a285b4eb600912/15063728230.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b5f5170a---misikojaralota.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tiwamutedu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7f42538048666e2777a7af3c0e2bc900/69097733524.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/neziku.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081d35931d1a---67802856576.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rl1heo4hoqli7rfavosqnq37sb/buwovokoxefuberipegivap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ao+smith+tankless+resetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 16588 bytes
SHA-256: d1e3ba7c1b2b1ab775cf70d94755bc093d2652f2c144c7f5cfb34b4db0395990

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