Malicious PDF — malware analysis report

Static analysis result for SHA-256 23531ae80ad01e47…

MALICIOUS

PDF

89.7 KB Created: 2021-07-26 01:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9091f98a5a647deca25c9f20fe450bb3 SHA-1: 20fd887096dc83c9b38b7b643dd3bb8a651a874b SHA-256: 23531ae80ad01e4797a0c216d0d10934cb98338f079b0075835317348bc613eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's structure suggests it's designed to host a link farm, likely to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c490ad21e2e---jerovo.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837aff0821---46573359633.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e1785cc9---sirupo.pdf
    • https://angkalaris.com/contents//files/21237681858.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773f3147e4f---6457061842.pdf
    • http://forglass.sk/userfiles/file/37570513925.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8340a1d5c---varovisak.pdf
    • http://ropesadventure.com/d/files/jobijuvubenafa.pdf
    • http://aite-materials.com/upfiles/file/saxizupukalisanunoz.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c666747cf9a---kexekodawijudabariwiwi.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b123887873---85552264882.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3e57d21a---82961805401.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6afc9e47---budizivobosufati.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071355542c37---dezosofogekerepiwuwujo.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/88221091733.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607082706b30c---zinenitolav.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2d0d1753bd53715414a5a2ae5b254207/dipasawekojimajotu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b4586caaf39e5fd555ea4cb9f9e87925/61024379439.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/72157637375.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/zumisuwimosumonemulanin.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db449e10b8---23411559579.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77fae3645---vimusorarubewozelaxibuma.pdf
    • http://stihoplet.by/upload/editor/files/lumajugibadosa.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160757440daaa9---zofefatikipibewibiseva.pdf
    • http://redondoclassicburger.com/uploads/files/tedofaposu.pdf
    • https://careersourceokaloosawalton.com/files/public/wokivedaxefigilodegusum.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a12beeb0358---98520567646.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+good+bacteria+in+yogurt
    • 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_off0000faa4.bin
0511d15a348f7c29c4dcefc7b3363529737ccf6b12b6ffad1887545cc3a270f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 17016 bytes
font_01_sfnt_off000126f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
font_02_sfnt_off00013f0d.bin
db805b58fc636039bc3ef1402c652a7e1c0a0ccdc76997979023fefc27527bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 10932 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.