Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05dff5f4785d7d9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-06 00:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d32e1f6a4adbab1df71222ca9abc60c SHA-1: c4b649bdf20d1e19ed8c5736aa1d2b047fdb101e SHA-256: a05dff5f4785d7d9434400735c3c50e7c7fb5bb20793c95cae30de69fbfeeec8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://eastmanllc.net/ckfinder/userfiles/files/fuvifesixoka.pdf In PDF document text
    • http://manpukulivermore.com/uploads/files/tetokivevinuvodu.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/jerawak.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088779106323---rimejumani.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/p7kqebob0nnjp9ju2p8uvnmrk4/puwuzowezoxigasifalaguka.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/48555730218.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21eb88bb4c---woloraduj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608398b714dc6---vinepudafewujub.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/10255767976.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/sutonukukodu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f8f0557ec8bfb8c0bf52dd1cb888d55a/67771239493.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zofinot.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9197b936d---lojajadogiponap.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1cn9lmf7edrsiipaue5jlru7t6/96301082549.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4neu3ci5h2l1a162k10id6fdv4/55881278148.pdfIn PDF document text
    • http://turnyras.lt/Files/file/17332935878.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4d01c54b---83637911193.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/febb81976d16cd4d02e5fb8318ee8584/72406270899.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vetuxadapuralidezoxenabut.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zigafaped.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/bodowewuvas.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43e5bf192---limadabe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tibos9minvhn17fif4a55avg9s/pazomapuruluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=circle+geometry+theorems+grade+12+pdfPDF 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_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 14896 bytes
SHA-256: ecff7a584adf861a473b95e8c291edd4168e9e812dba9b6c4d43258c8921e53a
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 11280 bytes
SHA-256: fda42091daa7c8d2fd2cf02da8f5f13f3912fd51bfaf38d2becf98698c4e37ff

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