Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba36aaaeecf09e8c…

MALICIOUS

PDF

83.6 KB Created: 2021-07-20 13:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e148e21be2262d5a8f5e5bb894a0da9d SHA-1: a0cc6e898efbfc17f42276d454976a29c78e74dc SHA-256: ba36aaaeecf09e8c247cecf2cdc1749e496aeba59316071c470942f02d242469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/73985963551.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n74cbbcf0ackmso5cuqgh9thrn/47685003448.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/93537143796.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vozaladajuditiga.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/90667215803.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3691f1ab22bbf5487c96990021a2ab9e/wuxujuzazazedegivas.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/xovinekezis.pdfIn PDF document text
    • http://iworking.vn/uploads/files/deten.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/zinajototenadovufoza.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/wupebuzo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba9c483e9b530626fced7195bc3e6fd3/bulegumuvoti.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2qrgnh5itkb2fe7q2ke6of7aq2/63193322132.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wirajenozobete.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/9077804922.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/21728884283.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/ruwepoboxazobe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac9e219a8---76873971224.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bolatuvosifuvo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5ba64cc91d638ec84c92be3c83cdaba6/kigibadebigamodabogiju.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d31872f9d3ec4925d2197183b225a752/90203847044.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9498cd4a35dab7ec2e089cfd1a689067/fejumiruzep.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3f8bb80b---62703328199.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99567615c---48415646380.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608058b3325dc---65046280731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=general+ledger+template+printablePDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16936 bytes
SHA-256: 8e97dddf1c2d77bc93d984766afd4801d2a6ba3fc35b20a06eebb8a197151dd6
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 10624 bytes
SHA-256: dc15c4bd4ee872143430b63c07fd3b3055c0ad76da5fdc236e23e4bb81965b2d

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