Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d328083ec0df63…

MALICIOUS

PDF

122.6 KB Created: 2021-09-01 14:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3dad44b64a5ac00c8fbbc0f182928a9 SHA-1: 3da16535f385968ddd47c0a17d96ddf3e7c9ef85 SHA-256: 18d328083ec0df63b991ac692ef90aaf30a3909d349e42517f84c8dbb6408bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress sites. These sites host further PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5402fa4e43778fa0a122031a3cebc28f/72075774646.pdf In PDF document text
    • http://morethancars.nl/uploads/edytor/file/90340661700.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e2d021be6---31891272795.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2f937ca8---fiminixiwurekudeziso.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bokiwunejekurukaruvunas.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e76727123e3---wakujileweneze.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813360f3394---jekimofifililaxosoj.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nutobim.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/81c71d3c66571c7fd980da62d6c0743e/99454951235.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/72971119862.pdfIn PDF document text
    • https://funbugs.ie/files/file/75052221429.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/fatonujununi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/31c9164e512982b58a010afbfb3b0fd3/punekufiwejujukusev.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e10b2656---kokixugopepinavaxunafa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/61c7d38a98cf9bab697fa8b9349bc0b2/85188719296.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pevanepivezanafekud.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/29704341205.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/od7g5qiunnsvldrj945cbbb416/robuxogatawegakepi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdd124d77---munamamekubowulej.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/7781005938.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-13/20210513160635362729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=speed+patrolled+by+aircraftPDF 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_off00017740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17740 10672 bytes
SHA-256: 271f0bfc18dcca3f94184833a4a2fcde9e6b0c9e86e598eb81adb00733adaa93
font_01_sfnt_off00018fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B2 19700 bytes
SHA-256: 7cc203e92419cb9fc74ea0297e8ebcba1188bdbb97c50a3030bb976f12f57013

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