Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8fe7ab50bfbd11…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 10:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 418e56f383c0d70f5abd470d072b4bf1 SHA-1: 8d4bc9ef2d1753fbcffc74f3c0411978ff03ad8d SHA-256: ec8fe7ab50bfbd11656316deb3e92c1857359cd69aa9e35d6d8cd7320c4b5773
176 Risk Score

Malware Insights

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

The file is a PDF that utilizes a link farm strategy to direct users to potentially malicious content, as indicated by multiple heuristics including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely involving a callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://imagebuzz.net/ckfinder/userfiles/files/xeguvugixijo.pdf In PDF document text
    • https://ayurvedaemart.com/uploads/file/77053935989.pdfIn PDF document text
    • http://ahchala.com/img/file/vonetopumodimoboxiritu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59058930180.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/wubasezivipini.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc8da5ee4---powawizani.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607414a132808---miwiluviluvanujeropux.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9eb75486---gotip.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d795045d---51037779426.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1ae0387189d120884fb6702dd33f0a82/11437645054.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877c0c29f47---50152753709.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/mofowunelobuwifedonuz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090cac407f30---12504346358.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4926535bc6---zabovopuw.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e016c92669---fivatisuvojazotipenij.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/pekepujoxori.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/116ad6588febe743870c53d5f663ca1b/rosuwadolobikuvigiwop.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7b36341e68af9686e9c1cecbd43a2695/58263419285.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9227205d---dufidobexu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/da6c3d126b348837686a0406873aba69/nujaropomal.pdfIn PDF document text
    • https://andrejc.si/files/file/bajefegarogesoxuwu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/32529314665.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/62ej7gdapfqifadmss0s1cac9e/11670796275.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/39764808000.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/23047677887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=accounting+for+consignment+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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 17392 bytes
SHA-256: 969a8121425bafe924844da85e6ddd8233200ade634e0f514d252e56fff99f1d
font_01_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 10836 bytes
SHA-256: e1385049a1de7d4e9f677b18e445ab0977a565bd3acae0aaf1ec757786ad8d02
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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