Malicious PDF — malware analysis report

Static analysis result for SHA-256 654578b282495cb4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 02:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4040c97dee31795bbb88b74a8474a12 SHA-1: 313dcdbe97cac9c692969e17a5441ac54921b12a SHA-256: 654578b282495cb4b30e980618b1cbe823bcd5d6fee17fe2c3dd3e1bac514e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of external URIs and a link farm structure suggests an attempt to redirect users to phishing or malware distribution sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pixomot.ru/uplcv?utm_term=chemistry+ions+in+chemical+compounds+answers PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8ijcde42j5r95euj2vv8n0vlc7/50374483666.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/zatumafowuvofizufo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2bc17580c---fizobasutinosobotaseroma.pdfIn PDF document text
    • http://one9five.com/userfiles/files/dobelulepig.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/nopogevekekona.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/zasiwof.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9m9b47i2sekfuag1f8lt88smu3/puwekokamudu.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zukubemu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bv000vt9cj1tg72qdmqa4akb96/11584474455.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/bonewexokedadevazop.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5c1d8fdb95593bed590c4b131769b8f/zegixurovadinitul.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160854a7dbc62f---29915305519.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nagubimesosonenim.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b0164423e13ae1e60c43d78586d060d4/begekubibobedowasuru.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o596e7d8bu3q9bqf3dio6nqtn3/gediragebu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/efvlq2biciidh1lskp79qeamo6/79882399961.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a5626bf319d---31709489351.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf30ebfd4d---66020439509.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/rorupoleworadalavel.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1dqsvce4dr7lr7kgrojsg4mai/dusorupafujozan.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/jijifap.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/66267308466.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/402c654164d86a4b9333d58d6047341d/betesowisapoxo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5814fa8b---99585447072.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6941dcd6bf64fdc7a848a6c955aee789/ramijepawonitanexibeg.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/57930531242.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/27896815353.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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16228 bytes
SHA-256: 99a2d3a3f5a32bb2b44d0cdc42169ba96e5ab783a986bc90a5b55b21af401178
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 11112 bytes
SHA-256: 342320dfad1df61c8607d8f261e5c1cb79c5851873d3dddadf2d395e47f18f5b

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