Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30071a364296e86…

MALICIOUS

PDF

71.9 KB Created: 2021-07-05 06:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68f36b153de96b13c7c2217814e873ec SHA-1: b39543b82dc61b0cebe9deced0291ad38b251340 SHA-256: f30071a364296e86bcff9952db6e06a64c2d9a892d4400341432b775b503bf87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/19d4500dc299d3c31b57158025a40d9b/49506240388.pdf
    • http://harasim.cz/uploaded/files/sesatedilebisexevif.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/delomowivoko.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081beda20de2---wufimopov.pdf
    • http://noithattamphuong.com/upload/files/71510884788.pdf
    • https://agatanorek.com/files/file/30280374025.pdf
    • https://biocoils.com/img/file/26115400941.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f5e731c4---37838787717.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nv70pv624bqm3i42u7lo0v8j77/jaxuravelogof.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dgl0stvrtgmbnabmkhi99cd662/wekidefivowaxitukam.pdf
    • http://septumdent.com/img/userfiles/files/6391451597.pdf
    • http://dunajecbiala.pl/upload/File/xosomisolekejat.pdf
    • http://bigband-ulm.de/userfiles/files/74815739297.pdf
    • http://fritz-fahrlaender.ch/download/gujewufokexanewesitenopar.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a12681bdfb3a9ae73808c71f87fa00c/38088533637.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/50658499244.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f1d069bb---kesotezezovuta.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/302db8815c5c7d12e2112098eb747de3/17374880325.pdf
    • http://kaupa.cz/userfiles/file/40505978431.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ad4d980e64d2336a6c7d70acf2367a3e/bixuwubewosufexitaxag.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acadeda4ab---mozobajanaroxotu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hotels+in+apalachicola+florida
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 16792 bytes
font_01_sfnt_off0000cf06.bin
397e7c0ea5071a3c7ae6cf14a282552526013cc5dc6048db928fcb63ecb5f270
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 10708 bytes
font_02_sfnt_off0000e777.bin
6ee2cb3332880111c82e50bb240249a98cbe1fb53a6f0515068681bf69264b58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16472 bytes