Malicious PDF — malware analysis report

Static analysis result for SHA-256 82037964ef055e1c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 17:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb92a84b3820eef5607482940e6c87ab SHA-1: 0ffc7a48f71622bc803f68b3bb6fd6bba451bfd9 SHA-256: 82037964ef055e1cc78fa6271fc03737b0d5812bb157324c111a4562ba75128e
196 Risk Score

Malware Insights

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

This PDF file is detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious software by posing as a necessary browser update or extension. The numerous embedded URLs, many hosted on compromised WordPress sites or disposable domains, likely serve as download locations for secondary payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=english+syllabus+class+12+cbse+2019-20+pdf PDF link annotation
    • https://liderpin.com/calisma2/files/uploads/gumom.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/64140083783.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/sogip.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9a796ce24d88dd02a235cc7e7e9b8f60/88597369797.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e0af2310221f7257a9131596b4f3fef0/59174210735.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160852526a2209---tumunafowokefaruje.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wajunafepap.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097334b7c80b---melemetomi.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/bifono.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/712ec75b2d23cd445df698e09f99c5e1/wanolupusa.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dixawix.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/bafafelalatetozamufed.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/17052102761.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe29440845---fugibokidudoturari.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/29384258986.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/83617443285.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/003680ed1a5c214702de2de85c37f4cc/satibezubasujebonuzub.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/saxatupifu.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/73500583033.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/xufabori.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/91e2676ff6b96f81aa61a2ca4ce52108/zafesosepawutoza.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c7e8350---libawuzajokonewagosoxug.pdfIn PDF document text
    • http://myqself.com/upload/files/fipakivimosefufen.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/mosiliwusilel.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29560797787.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 21772 bytes
SHA-256: c1a07f3a6e4442f3e73edb89789999a56c8437690a93fd00aa4fdd69a6f23b10
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 11412 bytes
SHA-256: e0b6ab154d8fabd0e67c32a9af5eaa659632e5509ba30b408a9deb2d0296a5e6
font_03_sfnt_off00014b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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