Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd01f9eade8c1403…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 15:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23fdcfe0e791072e2fc7d0ee8587b424 SHA-1: 3a4c75dfcb61e1c8c8d6df76203db3c8c799638e SHA-256: cd01f9eade8c1403ed94742afbde196dfe39a653400364bc8f4b7590abab0297
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links and SEO-optimized disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://palakkadtourism.in/ckfinder/userfiles/files/8139099776.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/61282388268.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/53539697637.pdfIn PDF document text
    • http://aimic.com/userfiles/file/sajubopupefumuj.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/af9304469c4aafb0f719de037acc2d60/rujide.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa94f31d---minutokot.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d1ca5f6b7563bb6cca25955bfa22dc68/10009878957.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/zuviwafaten.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12503586309.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/79599866621.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/984929c345c643f1f0ff64d9a045b51e/sekepekokewerizujo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757f28ba2cc---pojovopov.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/temolugivexuriv.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4e32c8c0f982d592f77b0c41b5f146a/gazobasujal.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/sejafinowugan.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2349543943---nekugudeg.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gituguxe.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/zamup.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/82da1d53ffd713c28d803c9ecf3082f0/71340315715.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/moduvugesiju.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a310492e305---93254289591.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/85a72742eba1d6682b4ce593454bd38c/45888016793.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/denamolulusamaw.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9e6t9l2cnqqibn2d2jhadsaqv7/xetijaganudupasuf.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/negogunefobujar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+to+use+in+place+of+parchment+paperPDF 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_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10840 bytes
SHA-256: f3ebd31660b73901e24f12ea79cd9f0b6774844d7b23e5ee855412cbbfa82f57
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 17392 bytes
SHA-256: 9a42924110505432950a598bef9c6e207a81b33110fbee67f5ad0e5d1ebd81c1

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