Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde4978939505850…

MALICIOUS

PDF

85.8 KB Created: 2021-07-23 20:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d13dd4d85b3502d7dd689dde23ee6b67 SHA-1: a09ef73966a07c211d78af51209833968c002fa5 SHA-256: fde4978939505850b0cb7a1be3267a471732c88258e0bf8627aeb0249baa72ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting it's used to redirect users to malicious content. The presence of numerous external URIs and a link farm on disposable hosting strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://a-daily.jp/app/webroot/contents_img/files/44432035897.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ed83bda7---rupajita.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/85621867560.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/todametudilasunosug.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bd33df37---pumomivazagofiru.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/zamobusiguxiw.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/kipawa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/n02oc8lbmmhao8i6oq8dgsqhg1/mizobaf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h437rfpce3g5dut0lp0rflbi0v/miporosemeg.pdfIn PDF document text
    • http://prestopc.it/upload/file/nexale.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/410897bbdd9b5fb365e67cec7973a691/lenabofonovigi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2defc9100---jivirileb.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5d5cf8b47b330f66d56396748f7c0a78/zisuzovete.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/76d8f51e013f2ac134fe0a9f16628928/vewaruposugetumaro.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/09f8qbesmn78erkvcfj0i93go4/semuzowum.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/termmbbrq55r35erfjr8ibnnp6/30138215476.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65bf7c21fd---zawexurerovunedanuseweni.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5287f7762c---sinovejofofavane.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b851ddba713---satisevogaretukefovupo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31a0b75b3---85579085847.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/katatuxekowoto.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6ead196b1e48684981c32a80c81b3949/deberizesemamexofafap.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q7vmbgpl64u26bsrgr27l00hcg/4566699942.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xizulukinulitamu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7946f6669264510a0b7d678967106bb2/zufizag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jesus+bleibet+meine+freude+partitura+piano+pdfPDF 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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 18084 bytes
SHA-256: cac9070cd9a5c8401c4c07910e916087729cb4168ff43ebd7eb02869604bf9e0
font_02_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 10892 bytes
SHA-256: e9c50e3d0a1eddb8fd29676bb96539a9e4cd8575aaff61b19f3fcc12692c21a0

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