Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd983ab83d83fe8…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 22:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8362b108d5eb81106499842a09ed949 SHA-1: a9cadd47d718c7d8355c749f1ad93494cf8be0c5 SHA-256: 5dd983ab83d83fe87327991a018b290097f4a3a364ed50f3aece3a9e1d8b2301
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://safetypath.net/cms_images/xeruxuzu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a849ee0e191---80864251880.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e7ede17e---31840851874.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/g3a5fheticncs34i4iaitslokk/zotutexosilivata.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f87c53b40---83913439057.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82e0d7ff3---68278271473.pdf
    • https://mmszke.hu/files/file/76419356877.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/q4c1t73dlf8l9f2fpp3tinrbso/2660023114.pdf
    • http://geotersrl.it/file/litawifikokuzaputekojo.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i901o8p1gdc5fo46sajuo1q6ve/73451662875.pdf
    • http://immopolignano.lu/images/lafejipowakukoruvek.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3cfd239cd8f17dcd16664093d0e55e9/73183101445.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abe641213ca---55274109080.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0410qj8228cpcn5ofqrub4qvo6/kukoxedux.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ef248b1d---visizonifu.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0664d395---wezizakubinonefazosab.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bda5400bd---kujirebunog.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3n4jj8b3q62qn4tru90cr61vq4/xirixojoniwudukowanile.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160731bd27a52b---52336050139.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c806c2745---guwozago.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92198cfc2e---gojofax.pdf
    • https://actorconseil.com/files/file/fuzamuv.pdf
    • https://accuratesearch.com/userfiles/file/tojowipe.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607238c5ee743---18113017555.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=one+page+business+proposal
    • 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_off0000fac7.bin
2c4c40ffed934c6f3a93d363ca1fa012f8e2aa52f37dd0592b9a0004cd26d568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 10592 bytes
font_01_sfnt_off000112de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
font_02_sfnt_off00012af0.bin
359085ea0e7c33d90f8b79bf7c2ff6152205b169b0ff62318e40d61465cde1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 17580 bytes

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