Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e167a8e4cd9dda7…

MALICIOUS

PDF

59.4 KB Created: 2021-06-19 22:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 21ae20da820d18e3c356c02f35d2276a SHA-1: 8f7d1218d253a8e00ca9d476d679bae6e3473ab9 SHA-256: 5e167a8e4cd9dda7bd7d40dc35a70c160e7bca2a272f4dca4d64ad22f78e444c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Among us free game play online', likely a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=among+us+free+game+play+online PDF link annotation
    • https://n-zvuk.ru/upload/file/79162547868.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098900ecfdf2---vadezajovojudituwigi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/fanapujokanefa.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/39625723288.pdfIn PDF document text
    • http://ubest.ru/images/file/9873565790.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r21sfikts228a2qqug9f93a7s6/90931672542.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774e15e5396---gadebu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7ad152d5221472a09231f5c6c41584ca/75463485443.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb1c713f1b3213445b3d700d7fe4bd25/nirijalogabivukata.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c464dfe6---935405555.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/45508141867.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6e17129425ee6c6733dcd948a4087d3e/88516349819.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/xafefob.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/613a5cfb288f0dcf3a8fd99529ed354a/femuwosutiworaxot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 5312 bytes
SHA-256: b84969c4547a9d51f2ee77e3a4d938131a60cd46b552a75ea17a52d25d3c784e
font_01_sfnt_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 9228 bytes
SHA-256: df1726b9a08aba25b9c5858423f885838cb930b115013168eb3264ed5b6e9a96

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