Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2a813598d500f8…

MALICIOUS

PDF

73.3 KB Created: 2021-06-20 18:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54be31ed41833cd8e37f5933108351ad SHA-1: 7146114e34ef7c76ae72faff98a88ffbe3bf5593 SHA-256: 7d2a813598d500f82f4b4d8d08f5edc8ae1183e0a7550c54609aaa62c5aa406e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be related to 'Vitals for a 2 year old', a common lure for phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac492a7616f---31456802600.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4753cc8f8---tidolafitomenizotefab.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ea6bb138---mumodomejaxoresu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d1786bf4---mofurexuku.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a18ad415---feboxedejusinonev.pdf
    • https://ludifrance.fr/userfiles/file/22522098095.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b27fc94e6d5---62147904958.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/892d7cd4e75925facdb0cd4525c60690/1684336605.pdf
    • http://dansensvenner.dk/imagesfile/%5C/79854384062.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/01c975b0fc195269d826c722539c045b/xugolezifapurakawabakujo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9ce2cf5b---32591298512.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d387727ac2ae8ff9040e3d07f97cb1b0/wakutujowozamodanon.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kqou7k22p842j05vt7akm79b83/65712028661.pdf
    • http://svsteinfurth.de/radsportfiles/file/tigonewupaxixijerevixexaj.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/50f40d4660b1709d60e6d13ce958815d/49226544152.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/n2eplvqt81h8edrqlocasnchi6/ditexoxepaparaxanulix.pdf
    • http://caphegiabao.com/upload/fck/file/88245786739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vitals+for+a+2+year+old
    • 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_off0000e28b.bin
8c3518fe6226093d27ddeed1ae3511da23cca509ec74e9d56711c5672c56bd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 5100 bytes
font_01_sfnt_off0000f402.bin
a5fa3c055270653ba05c384f73cf956c89884bca861b36addb9c0f11ac8d4777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10596 bytes

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