Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffb7ee2b122ad3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 07:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c27c6981b0cbdd30a70f39e05febab72 SHA-1: c41e2083e40f9952e26ba3990618d0b518f6867c SHA-256: b8ffb7ee2b122ad325f8182788fbee1dc41544b2bbbb3068fd45abc18bd831f1
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of these links suggests an attempt to exploit users through deceptive content, aligning with phishing and client execution attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=egalite+for+all+worksheet PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb7aac32e---xatozexomekuviz.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fdkk4u44r2j45189oso67037ut/bisenudomenamituzopuguvat.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76baa9824c---73291200189.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/pamodakulodegigu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f33l21qga0ip6vcl6d25gnfdp7/gaxefinuxav.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1avl6l9his7r0rsvv0jbp7u6mf/sapivubusilexewu.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/pozirolugavudezebipol.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791aa63e91e---65311084545.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/55350335872.pdfIn PDF document text
    • https://pindimana.in/uploads/file/49700044595.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/35db359269b6ec0061f527faf12c7650/37312744013.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/jesogilirogulimikalafu.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/51418355496.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfe4de580---rufewufa.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fkc5d8s061trdgnel6agk86u68/60961867711.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44e14f6cb---jokekal.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/78201252760.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/geworezerezu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c21996f---63310884857.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b239ddcaeeed0ff523cb232820c60c2e/losegiromixilepexo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68feb1a19---77627559079.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ug24ghpnljgun5kgfnai9j7q9r/pufowaretalenomot.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/javiwis.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210630/file/16250038791891.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 18584 bytes
SHA-256: 10f7b4112723a959a2907a5d3eab4a18c5a838964a1813f7fc8c1c05955a7ad6
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10552 bytes
SHA-256: 1d78bdd98ab4e8d231ad63086b774b951a57335f16063452dc19b36e59c494f9
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1