Malicious PDF — malware analysis report

Static analysis result for SHA-256 521019cc42d3f23b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 15:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9624c6e7a3fa590eaf22d2c9612a8fbb SHA-1: abd0bd3821449740bec25eaba0b061bbe1187c6a SHA-256: 521019cc42d3f23bf64a57bd5856375991d190303137611df7329087c7877647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with techniques used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hanasushichoice.com/uploads/files/pafosef.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f580ab567e7a3ea6daf361181b5d0f5f/71300001610.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6c76e396---xewetejujugesewuwolufis.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hmg830q5i1bo3eas07v7nhuvfh/99767775375.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/gazigawifibokawa.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/81122718536.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/66242723481.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/gizeja.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ugc058b4am3ben4qm6fl6r6294/kapebepelifoxexitola.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a546255b---53968986972.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/bokarewisiw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe8460ff5a---36968642624.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/nexutebobafozimovabu.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/pixajopaloturunefibe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/fc0bfe2e2898d38a4b05cda4f27e189c/95060941456.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/vazefijiraneluxunejo.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/kotoroxagigivabugojugiwo.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/5932175812.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/94765243930.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b288c8d581---pefewiwigoluxibi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/57685333377.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///56253158287.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161042df67c15f---tokexipokoded.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/saffrbt245c6ftv4vkeh8pf834/xuponiteforapiw.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/retamifujowobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=i+dreamed+a+dream+sheet+music+pdf+freePDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 17384 bytes
SHA-256: c2daceaf06b4414181f37d4d3e896f0fef0df8027f00202accb14958ae25e25c
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 10668 bytes
SHA-256: eb85feb6af4158f0aee20cfa947561cdece1765a7773eb5c766ba5cd720f13a7

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