Malicious PDF — malware analysis report

Static analysis result for SHA-256 2899a5228a2e16c4…

MALICIOUS

PDF

78.6 KB Created: 2021-08-14 06:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5dc4102be7f9884ee6c0563869b909c4 SHA-1: 3d03fff98b1d96cee7b989265eb0e2d7511174e8 SHA-256: 2899a5228a2e16c47bf69d6ce48685ca415ed0043ad92835d967cb7c993f9364
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Analysis reveals the document functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of numerous links on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885d0a9270b---dulokelodumiro.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a6a62abde5d5f53eabc6c4daf35b0ec6/terabajowezozulamajipugiz.pdfIn PDF document text
    • http://amdind.com/userfiles/file/samivigojumupa.pdfIn PDF document text
    • https://codecs.ro/images/file/fuwukulovin.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe70a98a2---6680708757.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gbk28jiikikocd8h7s5r647fad/97977485754.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nomuzemutiverawal.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/40601042875.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a69055186---39620030873.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/60792d0703f18edd65fe7272763f9855/96380173596.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee11e9eb1a---63913555007.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/fiwepabog.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/zaxivogapoxifanaparovud.pdfIn PDF document text
    • http://bakoca.hu/files/file/98555481991.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/kisigomozizin.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0f5593fc---nikekiwabex.pdfIn PDF document text
    • http://sam-global.info/files/file/96616353624.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/vejulodesejerawegovidabaz.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/dapoforikawumigewosapadu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2sv3me4cqvokpdlk1mek97o8se/bowufimano.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/83ba7c764affd068022a86fbe50b8e59/84915547442.pdfIn PDF document text
    • http://cloverdiamond.com/file/kibebivadexokuve.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/pumukubotigatuw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d75b40c---52016740453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+secret+life+of+walter+mitty+soundtrack+listPDF 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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 17772 bytes
SHA-256: 3dd6efbc18022a46be899a532d31e94f97477f83848efe43d0420f169a5b2e68
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 11096 bytes
SHA-256: 628de182c3881be0293f8d7d028d2957fdb554f936635e56662e3ddbbb0a8883