Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c9387c316178be…

MALICIOUS

PDF

68.7 KB Created: 2021-05-03 19:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5a51d77c51b04fa1eda21dbb121814 SHA-1: 1b1e35453fddddb5a98b19a41ab0dec5176c6b53 SHA-256: a0c9387c316178bed75551bc69599692749c20d11f465d54177c1a393c50fb29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to training and PDF, aligning with a lure. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/401a4c485d3ac41b7bafa3656aef0f54/nowona.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e947fd59b0---24836154822.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/441ff226d86f17c23e05df80ab34f356/51843682146.pdf
    • http://agiusfuneraldirectors.com/files/file/85639253617.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4pabamb0poc6qjlgvuv99k15sv/riloje.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80093d3d7---40546640635.pdf
    • https://ancoraeducacion.com/images/dejivuvoso.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1e3de6bb91bdd7a8de24b01aa467322b/83560269404.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac9a40245---14780818259.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/d5b6adec4dc1be66b0644afc63ae9645/49360981785.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9ef96914---bazigezovisesiwekefip.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ec32f0fd9a6ab751ce4aafe846bdafa/rukelowopesokalujibut.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e90db7194233ae3f0a98c7522cad1b48/werakujifeki.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sln6k5aj10if3dg5hc4hpvi6ht/40847161738.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=functional+power+training+rusin+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccee.bin
3c060b4ecad377e52f48cee343cc02fbdd71a125778baad5bc416eda13b07718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 5372 bytes
font_01_sfnt_off0000df58.bin
380ff4cf95833067954fbde857d4db7385b503862d8094e99bf5f6b2f5a3e916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 10824 bytes

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