Malicious PDF — malware analysis report

Static analysis result for SHA-256 08adc636b66bd0e9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 15:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 729c33f7b50239803e0d3930aa1e1419 SHA-1: 068ee77bbee7f4df0f3336b6aa3397169bfc4936 SHA-256: 08adc636b66bd0e9230002d94586867ac08be1b7556eb6611074dcfc739df219
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to various websites hosted on compromised CMS uploads and disposable domains. The presence of numerous links, many pointing to potentially malicious content, strongly suggests an intent to phish for information or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/cnqdl5rrfemgiemhg7dq6glsm1/dogomezobeturibewa.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2hbuqa7lm6jpq7hl7lutrm3bpj/nuviduradorirabex.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4f7b2ecf9ff178c00580901335bf45c9/26088512178.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/temop.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/22507293388.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5ac9031b7eaf13c625f3ce43bfd94e8b/tovemusotafulizuwakoda.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608eb81589cb3---86152252094.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hhksqk9kfdv01tisig22dd823/fomukujusonowikaxovagaso.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gokonufes.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gizudipiwezejabakaxizi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l7ra18dtbqeirj450d55k0f1a7/65115452970.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vajojaguwet.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/muvinabivabumap.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/27722065039.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/r8j4t9qmijpourtsr943as4enh/79891104108.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/vurimidopop.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b679c378a3a---fimugutuni.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bf616ab445d0aca2f9545d6a971739bd/winedejimejukusikevurivoj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/76483286839.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/revesopibepajomuwatosipu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2775d9be6a---79670631509.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b3a5243c175e4e1bd5294195b543d332/44049509805.pdfIn PDF document text
    • http://finchamauto.com/pics/fesuferi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5b28f1c656f9b8d3133bb12f31de59c3/tetofogojiburivapak.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faziwemozewodakonof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jlab+earbuds+air+manualPDF 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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 10424 bytes
SHA-256: f87d4424bb5d5e2ac627d000ec81a42ba4cd705694de9fe72cfa61b9e881033e
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 18540 bytes
SHA-256: 46fb45b4a3e0414c7db57faf3d382cdcf5cda5a107cd20eb6dce4a593eb21a8d
font_02_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1