Malicious PDF — malware analysis report

Static analysis result for SHA-256 563227d98f3e84cd…

MALICIOUS

PDF

95.0 KB Created: 2021-08-13 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37e6f83f2480d79ce91daab4b2584ff8 SHA-1: c6c5b625940aafd6f3edd8ae7a8044215a7d8d52 SHA-256: 563227d98f3e84cdea27871e963177b73546d59a84f28c4975a3fae7d75c0244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. The presence of multiple distinct hosts and the use of link farms suggest an attempt to obscure the ultimate malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160890e53f3164---11851769139.pdf In PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/losulalulevepojiti.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/gilini.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sp31a63f9itvoe4ktjv31v9ur5/zukilajosexuf.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/63up6hfcel2mqfkohmgk891h7e/14523787280.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/746022673.pdfIn PDF document text
    • https://andana.us/files/files/kimaliluzumame.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608865c7458ae---perupiragujigiwanebulo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/rapapuwogifuje.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tekofusuwubitojixuwafe.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e64fca9be46339a45c2c719967a38365/wasaxaluvekesegogiro.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/67605364797.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607726442965f---56180510861.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210701180754.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607430550d5ad---jasezunoso.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4212fce8b2---46787333684.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fbb66077366217a6331430cc6145507/6560778219.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e91f07f57d---sukefo.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/63595062110.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/komefex.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rv75n9mk0am2a2ctb2vm7nglp1/77195645430.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47651050284.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a2750c22---besagozom.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4c9882577628c4d7f616739e9eb9d93e/tojati.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/27275938825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quiero+ser+maestro+6+elegibles+vigentesPDF 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_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 18524 bytes
SHA-256: d7cab7bbcc41c49934a2b7b2eabf11ad8fcc164dd953a5ca88589be17f3e93db
font_01_sfnt_off000139de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F5 10984 bytes
SHA-256: e59ee59df2eca0320ab1711925b7e6620d7af1d6adcb644668e8048e01ca050a