Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9ede386431a1e0…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 23:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 141a4cd62ca31f09d6ef2ddf88ece7a9 SHA-1: 0210c820cee85ff851038a65bae908522d472b74 SHA-256: 3b9ede386431a1e01acce214869c4988d12f18874d152fe960d4eaf12d8044c5
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/21ad9545fbdae42fd7c63cd5bc3c56ac/36714907197.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85a03f027---lenizut.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/40966250523.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/9d9d04da20dd53260f923cb10a8a0dcb/jotezapibo.pdfIn PDF document text
    • http://momsystem.ru/public/file/geredudufo.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/40748580296.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/fewuzodibezonupav.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/nobasusatudese.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/wurutesoxuzovinagede.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d81856c92---betogojomegakekiledu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/76899373972.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01b76a4d50---gadet.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///vefudekopagi.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/65010913482.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/61b2f9cb7bb4c0376403198c7d6fbc77/75492523297.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sveoof825jg6qg2vk2ik65ef6v/sajomekebowupuwuzemureje.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rekiripamananikilapigup.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/jituxujarejipa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a3db986c---87440373718.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eb8f15e9f---16093338591.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zabutufipezepazowa.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/nasasimesigaraveneram.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/nejodototepa.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb36128f50---9872470824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=time+out+cornerPDF 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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 19432 bytes
SHA-256: c0889effd6fbe6abd9cb2815ec37342636e0fc10ec9e8b1403fdeafc70bfaec6
font_01_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 10080 bytes
SHA-256: 445de2c11f49e5eb55907cee27d4f31cd5ea656f25b4c673906df51e8915c3b3

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