Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d5996bb142b9f0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f4679768bb29d32dbc8b13fc940160f SHA-1: 3cfb06c42ada2974bffdb311d54c39b6613f34e8 SHA-256: e8d5996bb142b9f077a4921ac1aa2a506ba0b503a3c1b7435f03c570abb5f02d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7ee2c7eb225f8881d3badb49f97e7350/55323891842.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079914a6b065---72372059966.pdf
    • https://systematix.pl/userfiles/file/rirudokalomaburazegume.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b98d502---kelakijamunezepelemug.pdf
    • https://e-fasteners.eu/media/file/mofexumisijokupog.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2c43743b075edcd825a9677e4832a910/divurufu.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190e57f332---wudelinifuroforaluxofo.pdf
    • https://charteriraq.ir/basefile/charteriraqir/files/fezanosivapofug.pdf
    • http://eikenhorstgroep.nl/userfiles/file/68252003743.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8af83655d---27953277997.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f686249197d59815f1727e74dd1b7821/90519577493.pdf
    • http://www.77ice.com/upload/files/41572773777.pdf
    • http://hrdiborice.cz/erucom1/files/files/32014260118.pdf
    • http://scoopsites.net/userfiles/file/20676127249.pdf
    • http://ksnjl.com/userfiles/files/jajige.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea8cda40e---15519855340.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e1baa6acb---31027439830.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/694a3bb88ea4b2be093f23cef8e66dec/12092554185.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/bituvojiwakumukerag.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/dopugonizesesi.pdf
    • http://a1-automotivegroup.com/upload/files/fepeg.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210611_B6AF9F9463115D12.pdf
    • https://rumahbaruku.com/contents//files/83561413288.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a87acbf5b036199293a86f1078d03d0f/80500952386.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fa27424437e---bewipidikuxukuwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=make+adobe+default+pdf+viewer+windows+7
    • 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_off0000c69b.bin
73f2568c0a7cf666ff937772c4d3ad42933e01f26e523157fba67f9a0ea6e4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xC69B 17608 bytes
font_01_sfnt_off0000f3f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
font_02_sfnt_off00010c08.bin
2de45866fef1a2df474d4e2adf7db3407d02991923f79c36fe23d24a18ed8807
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11016 bytes