Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0343c6afd1f68d…

MALICIOUS

PDF

69.2 KB Created: 2021-05-15 18:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18e5b77f3d560abc7c55c3c1354f650 SHA-1: 382da3be3bad8deaa5f2ffd6bb653f33c61718b8 SHA-256: 2a0343c6afd1f68d61884299dd327d6bd134976364e5f3f9d510116dc7cd8738
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=biometria+fetal+valores+normales+pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac9a37b6d---zovetu.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/42422104173.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fac31c75---kasuxabujikabirilezib.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a0b9c3311cf3446486fb6b59f0923f62/60539168089.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e52e1b1ee---28030791540.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e79ebae5---66616256460.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d233428bde---65782623613.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4qgl5q8q1fndfe75fimsmprg1k/49597981472.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9d440c2d7bdae89e7d6836c4c355f4b0/vurejutalefovefa.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3863adb49b1199547fafe1d706cdbba4/56571166499.pdf
    • http://txextremecarts.com/userfiles/file/nuvofor.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/836273255e26f02734c2e2f64ea14a6a/maxupaginebera.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e9fa9ad84eb9288561fa481712227276/79378146812.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pnf8dpu12l7s45res8p035angi/xakudifola.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30b4b8b1f---96009133910.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cd5a.bin
37f93ef25bfeb2dcc36bfbdcc3035ba8ba2382ea435f5b756a348a4f012b98eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 5296 bytes
font_01_sfnt_off0000df4f.bin
98e5832df989e7fa9af71ee0e57097d88da80f41b5ca47d8130131c885f24dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 13232 bytes

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