Malicious PDF — malware analysis report

Static analysis result for SHA-256 3477576ae162a2c3…

MALICIOUS

PDF

81.1 KB Created: 2021-06-29 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2389015a453b6ea9781f92053b04c81d SHA-1: 2b7c70b92381d9665e30eb070d514c37687bb31c SHA-256: 3477576ae162a2c3edb222f9175f8c7b4c6e1489c8d331069b7b0238e134dca1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The presence of external URIs and link farm indicators suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=act+april+2019+form+b04+answers PDF link annotation
    • http://drthchowdary.net/userfiles/file/tikunujajirepulobufe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a65ee855---gimivatuvireluzol.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16de86c1f---25986533896.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/cc236bc127777aec60b49d69263d7ce0/jesanimerazujipowikunuj.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd26d663d---tinunudedovigipekumopex.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zotovofasuvozete.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jiduni.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fef1bb530284731cc4c193d0ec8d223b/suzerije.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/52401745045.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vevamerubuxokuzilamusiniz.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/43357161963.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/pimamamewilaludolupifa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8838bdbac---17534640980.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/magorunefatikatabesuxa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bc80be6d---91797208181.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/kolofumuveno.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bakuramogud.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/32425562445.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2455765146---99728404879.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16074f761a89c0---38053579343.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2bad5740---97715569791.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac7637b21---85565658302.pdfIn PDF document text
    • 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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 11388 bytes
SHA-256: b26fa37e27f44de4d3c6d940eb598fe369838d332b4ada18445a2d72282236b5
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 17288 bytes
SHA-256: e7f75745a44279d8036aa713fc3ab25f1054617a3b12253597ea95dd30c9e3b8

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