Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab44480b22caa67…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 14:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a777a12197d5c241298b27d3ed2ae8d SHA-1: fa39c75aab3c0d70f37ecd61597159e7242aed34 SHA-256: 4ab44480b22caa674c603a3f3ee977a2900b3233ec1d3ced1fae315d23717860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f4dda5d9e30a62c36201059cab8591d2/fojirosemirulusisem.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97892a233---19288483997.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/savizijabejaguti.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107082134516744.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/junerimixamoduzo.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/16333117903.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wuxiwasilunu.pdfIn PDF document text
    • http://dztechfin.com/upload/file///niwudiwimuxisireruno.pdfIn PDF document text
    • http://splogservice.ru/content/file/39099626252.pdfIn PDF document text
    • http://aweibel.com/Photo/file/25441663415.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/malapogorumeka.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/78959777612.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b62ed3809edee8715ab75b37b642bea9/pijoraweta.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/76063220085.pdfIn PDF document text
    • https://nevisnews.com/userfiles/jepubomaxakanudusezot.pdfIn PDF document text
    • http://belovosushi.ru/files/59233072037.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7760dfd9---wugawizisofifapuluwuwel.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2n73d7at5eign09orj83bu7vf6/74673313693.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jadogudateramuwo.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/sanupus.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f2ce9ae9---22280377324.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6294a1591---mewarivefo.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/1864086614.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160836dd8b10fc---68694289157.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/94649532929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=toyota+carina+e+owners+manualPDF 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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 19520 bytes
SHA-256: 9c5477d5b2a8a67d6426b92ca1c09ecf180d647b80beb0b0dc26755d4ce70b0c
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 10652 bytes
SHA-256: 40880a5693df08539c75042b8dfd52a6635234293bbb2c04fb2b6a49f35ef696

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