Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c69bcaca784a0eb…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 05:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711a6e2bada401796e624546946fa917 SHA-1: 183f0c36d5840da03ad5a8303d98ece7271ad782 SHA-256: 5c69bcaca784a0eb9072dda343c994e6cdc1f780bfcc6d1c657f3d1b8df5fe55
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm or SEO poisoning attack. The primary purpose appears to be redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://softwarefactory.nl/images/file/32948374226.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a98a5b4bed79203f0568c00076f7c6bd/26453006825.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/q17hgshhtci3r6oo3tuv4dmv1e/41440435053.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b3857b70e92b18e4917f2abf3ac695c2/47025351795.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2265541f---refotajufeba.pdf
    • http://yossy.biz/userfiles/file/bitirizibirotuxamimowani.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160918fdc75950---ligedonivubujinamaguwij.pdf
    • http://forter.vn/hinhanh/file/musemujilufebibaxep.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3b7b19c88270cfabf8edd30216da3a6d/bijofuv.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608469300eecb---felumumokar.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5f5f94eb336e304d23f1369834b55e2/46580571223.pdf
    • https://bamfieldrental.com/userfiles/file/72760166782.pdf
    • http://project-st.ru/userfiles/file/ruxinugiwarotinivexo.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af0880bb5c6---29690082377.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210529_DA7EB64C7EBDDAE0.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d239f3b87---91418295819.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e5fdc6ea41a2a07623c0abc425623c4a/85417688596.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2915f2a6c6---xutopabesofaluvez.pdf
    • http://anpo.vn/upload/files/10960444383.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8b3ce39e---34872473651.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba063d50f30---37122286165.pdf
    • http://thunderstar.cn/userfiles/file/20210507073817426585077.pdf
    • http://www.urbanwaterways.info/files/romamubeti.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/hqpk9ouj4proeem77ud7pgfqmc/bazimunefinafimibuxivod.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/b35dfeqbjba46qafnkqvhddpt5/lowigu.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f351d18a2ce72a3cebfabbd0494c61b0/nipodo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=database+project+proposal+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33e.bin
fbbc416861fce23da61552480ba0527e2872892e27bfe8dafc95d476e382eefb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 10688 bytes
font_01_sfnt_off00010bc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 16792 bytes
font_02_sfnt_off000123d3.bin
9fe91f3555151ea97c6f89a0a88d07d756fc39aa7264a0ef883378a7de062a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 17992 bytes