Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ec62d70edff4a4…

MALICIOUS

PDF

88.4 KB Created: 2021-07-19 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b6b2144a32230e7b893b32403df1f73 SHA-1: 1a748aac5008f6aef985b8bf97cbcd96b5db2128 SHA-256: 41ec62d70edff4a498f6a59681b626e6620b353d2cefb06fdafea01fb4c700c4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure itself is also noted as having duplicate object bodies, which can be an obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.euro-fly.eu/userfiles/files/bekolexawirisaf.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e6844ee5---11813039633.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fvig8sols3atn45oj6oso7ddjs/35581973788.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b136f008---sigalajopelen.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/d2nhe9jddudogc9rbkm6969p86/61108914070.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/wobakaxetajuliti.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4e4d6874---26883643253.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b918980---46779154940.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/79700013344.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2798911ca6bac5e15c4d9065fef9041e/44801184091.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097d4bdcc3f0---josewob.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/vugelitirevawemebab.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/17a2322f5761051cd5b258d77feb7224/kunoginogepunawaki.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/1724052857.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/osepajlmandnhop7r1l2tu1a13/35060990328.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/robudexeravude.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lojuki.pdfIn PDF document text
    • https://retta-bg.com/userfiles/44767893286.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dowitevonimezo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224f96a77c---wipasemivuvenov.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430094539159497.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/jabevagatatep.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd72a493a---jemisoxetodidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=neonatology+questions+and+answers+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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 17000 bytes
SHA-256: e51d9e704aae4b60cfd56907b6fe0bfde095b2f33b5164a0637480d73161af92
font_01_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 11096 bytes
SHA-256: eb5ea0c2cdcda9503fce5423e17e9bbb5ed18358ae30b139f870ab4f979cbed8
font_02_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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