Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea10107a0ac14d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 19:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09945634ba2d148fcaf2f1c433280b1a SHA-1: 67abeb743c8338af5843ff22922d936303379ef7 SHA-256: aaea10107a0ac14d7d818d8767bdd1df2e2388742224386f8b60c80f28ef6dcb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a68d010f---52566087644.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/342f99dcba9f8f57cb21f4bdd50e7bea/58794919544.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/78900717503.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/laduzunawamazomazoze.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/70448441555.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/34624680474.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f4da71ddd---58589719240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea9766df05---95060217419.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/87723694415.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/zemori.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/06t1iaad30oh20i8foh8ifuksk/kesejurogu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/8834714088.pdfIn PDF document text
    • http://moristas.com/userfiles/files/naxajitori.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/71999286885.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/58837250922.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/mosegexesipuvuvafuke.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/20086348877.pdfIn PDF document text
    • http://airzo.net/userData/board/file/36895896101.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16072f01aaae4d---47073250012.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844813d8cf5---37137789953.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759b87988bc---38836130181.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67e2b6e02e---51387953035.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/joxipex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=resort+hotel+business+plan+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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 10880 bytes
SHA-256: 082be65ea8c3ac5bc143988cb021ea2d563354c35502b6a52fce159dc83f6b70
font_02_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 15736 bytes
SHA-256: e6439fb9964bc96ff590140bd5859559727bfe1e756d5a33f10cafc982c136c8

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