Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fad8679f5020cb…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 03:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f41c8b4a8227aff72939346baeb5093b SHA-1: b82e8c4fcb83a5226fefd0969dcd0c83794674ee SHA-256: e3fad8679f5020cb3afa0e6db0539307c78cf715014f0c24302ec1704aa0ce96
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/456da5f9307a182fe62830b43540b645/fujapi.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/28579152448.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/vuvizirikanusatitifulixa.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/82905d3fad9a2635d81af580af62dbb3/90485610080.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1bcd868a7---37589742274.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fm3fdpl2qt4mbrkmhuaqa2v4j6/pafebiwomazaposiret.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3898be981db9299be28bd47ed0911bbf/93184046362.pdf
    • http://tlproduct.com/userfiles/file/18817471579.pdf
    • http://chickenwild.com/upload/contents/images/images/sikiwujevalotow.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1e3e8b9d469de40286f4d7c126ddd300/xijafapuj.pdf
    • http://ecotrans.vn/upload/userfiles/files/95365754256.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93f8ab4f5---73890977479.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608022d440187---gogilif.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb0ac9eda---nubeminunokuzukiwaka.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jimowafijurorewimirofo.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a192cfc5a007047904cd6e6bab14637b/2942205744.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607beab98c5e2---jisozobagoregojafa.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160751e7b98cff---rolenadapaxegitavovuwaj.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/samenirowipovutijexobiw.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d45ec105a55704a701256b81098c7d56/junavugu.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/beljkk6mnvpksdb8src474eemg/26262770288.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9204dd4c8b---69981592959.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/23a5bd1fabc53915284e87bf68f89c35/vipadukivubobagej.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ac37389d---jefogem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=miss+peregrine+director
    • 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_off0000fe5e.bin
a46cc8cd099621f87025d660510895410640f7b533b21e527b6bd0c821565788
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17096 bytes
font_01_sfnt_off00012ad3.bin
959e820219c6d23d1291fb08c3631821ce90f07729549f0a8b9712321395b9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 10476 bytes
font_02_sfnt_off00014289.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 16792 bytes