Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbf1c2657cff7e1…

MALICIOUS

PDF

84.8 KB Created: 2021-08-15 14:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79030558c7fbc15267cd754046cae857 SHA-1: 631437321fb67c843d5dc072a2fe999a53ed9bbe SHA-256: 9dbf1c2657cff7e1429ea9d8018bf93d25ce51f78105ed644586ca6df15ee4b4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The presence of these compromised and disposable domains suggests an attempt to obscure the ultimate destination, likely a phishing page or malware download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8037f66bfcbe2820f221a173444827e5/99086867127.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb25cb4285b13925e47dd35a44799e35/limawufelidekixerulur.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/28672e7f7a6b2c01ac4b890314904497/12000597835.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2f48cd1996e5f4ff43eb40b38e47a1ad/ritumokiluzigor.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4d6e2571bbf15c819a5f057f3fbe3761/45862683568.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/51444152326.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-31-04-51-32-59.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27b5be5bc7c4af5d8d3c29064a4b57b3/11083363833.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/jiwudo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7vv6qr0ir7sseaq28k828jmnim/rimosovoxaxanetamep.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bda56a380059c3499aceadd4d313af2a/52733120689.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dimawimip.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/39539178137.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc9d724e68---kosisusepolubudotaje.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zizisomez.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bafe6f69b---zoberinasi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xakumarufavozejap.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d27ccc8f1---55252714739.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/plr7rvsablu6vup62jvh54hjg7/fegetusa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0c2a56c6d4c453d0c1b00de2d7cd0e25/15074176539.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57dbb760d---soburikevovowifelag.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/de31c22ce23a65b2202d0a902f809206/zekabifojudujaguralewegob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pes+2013+yeni+sa%C3%A7+stilleri+yamas%C4%B1+indirPDF 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_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 11116 bytes
SHA-256: 24508f134a1aee454946092ea85c13dc63bb6de6af6c50aa0def2abac0f67e56
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 19552 bytes
SHA-256: f051d0ebd217ddc735aed122fcf90054f4ea0f9e5f6f86577e267f4da719eedf
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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