Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5f1b2005a2223f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 14:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 216d52e7495028d9233dbd6b452b0dc8 SHA-1: 37a440fdad1ab137286c61460e5a76b246d55a1f SHA-256: aa5f1b2005a2223f4a804832e9012c61051da773e5a7d0cca14002dab5e92d85
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a Google Feedproxy URL with 'fortnite hack apk pc' in the query parameters indicates a lure to attract users searching for potentially illicit software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t622aaisnkp8bd4aa4mj439o8p/guwabatimevome.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7apg1dd9p3e50ro4f5otf21gab/guxekofejukogum.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/renaviverugoxilidotewu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1164121e8e8e00003ed854110ebea512/volujelodem.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/32238737441.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1c1b0b08---vavasid.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/fesurozutezetiwuzo.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/12871674773.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/nonos.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rdp9jj3sg6d8shijaedil9csjg/fegemeto.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4221df0a76---34026288557.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2882384876090531ebe702.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/7585460400.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b9506f2e574a9e7fc4dcc57190924628/xabak.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2l5u6a1k8n59dgs2en4rlej99p/24661757018.pdfIn PDF document text
    • https://morabia.fi/images/file/gesigedeboginox.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a7a6a00c---jumume.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a61e24d18e8f903252909bf7e81fe65d/56242963849.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/14bab780bb35af1bf6b30bdc27081f38/vewuxeduwesinavuvewudimo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ff242930---wazefotate.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e632e819707---21149060642.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a099c587940---33498444419.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/laduzigakovobodefitewitit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+hack+apk+pcPDF 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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 18464 bytes
SHA-256: 974110ae211fbb1bef580522dafd0423addffef50d453643ba1c5326c03698aa
font_01_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 10328 bytes
SHA-256: a16d01627de7bfd5c64dd842639575a67579546b5eefd92dfb2d97442e2307c2

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