Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d5ad5c900647dd…

MALICIOUS

PDF

89.9 KB Created: 2021-07-16 22:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55355d528b9227ac1915d6fa41c70020 SHA-1: 287a5a6470b5451ae286ec8fb2b5f19850239301 SHA-256: 67d5ad5c900647dd6042e9e45a6e24a43c71ac76afb9576aa9a93624743578a0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b2694b0cd32---ledikitutir.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160969bb9a36af---mezigumawevaxelasisukot.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5f1f4b5f07109a64667134ede1c9c776/2907507026.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zogatenenunobusuwefut.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/dapakuleti.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8290dddf96589d6cd803717eb954768/puxemejefesenaxurodu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/267594fef98735c622e6ffc1dbc6432f/kakamejadofifokulaxox.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/88820126598.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/sibidenomoroxifew.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/44878334729.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8vskhc1u2h6ebjrs823apl5hb5/67378399618.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776084427d---67205020879.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/b62mn8kqva7frm6kupc9amroru/toxegiberodox.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7d61f7affb9cfbbaec2917ae9d65884b/jazotafot.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160987fa642b2f---delexezaxiwidobaxujarizu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffaa78f37---kodetexokutifewomojina.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9d289f3---49531324904.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///lewulowes.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/6408991380.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/91633385961.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f27e59c2b---26501786898.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/rowizotukidemibowiwelut.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fezisinafudinelusun.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00630572dd---vupasumotutefijujotar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=it%27s+perfectly+normal+full+book+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 17856 bytes
SHA-256: e25f59a6aa5cfdde2dd53ac3fc5e5df99db67d94f0d118e3df4b6103f5049b02
font_02_sfnt_off0001405a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 11072 bytes
SHA-256: 434defadfd85c6a65ba0756ff11843781e17c57b6a93abd889b8dd420293e872