Malicious PDF — malware analysis report

Static analysis result for SHA-256 6587bf1b72bb552a…

MALICIOUS

PDF

122.7 KB Created: 2021-08-09 09:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 354892771783c6e336afb8248fa1d3b8 SHA-1: b4fdff37ec5ef0c750532c61fe32c3d8f2374cbd SHA-256: 6587bf1b72bb552af75e659c8dc7eb8a8d3bee6f5811d656334cbb29059d1e1e
196 Risk Score

Malware Insights

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

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or download further payloads, aligning with phishing and client execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2666bc4b2e5654c7d7946a0810b24240/37375399862.pdf In PDF document text
    • http://diamond6ranch.com/userfiles/file/febubigonuvema.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/rizuxeza.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/nuxaxi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9ee76121---xafufavuzutuvakadejiru.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e7fae6ca8e449ce3ded588a28f584bf2/11164134196.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074a776e0a99---ponib.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83a10aa2a---jefesuxukalobi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nd7qhgubqkqefi3fijdk2l1r0k/79473900908.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/83302080156.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lovklcm74ud0ud02h1krl1o4c0/36429455859.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/73584887182.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb80e35cf---rofew.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/b128042e45666158a27530e689fc3865/12016444521.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c3f41a7c---jodesowifa.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/nakutidewegifotad.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73636c44c---sedav.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/16805197760.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/263240740cfad16cea85ba130ab4b25c/xiduvovuvejojaxasibo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6dd2b540f6a0885b68d146155ebd5804/webav.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826f624b6bc---bixuveradugaki.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609897cc0a2cc---matijepatazufegelodejosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=subway+surfers+unblocked+games+wtfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16236 18244 bytes
SHA-256: a07b025e90979bbe475edccd0d772a17f9bc974389997044ab91bd4f652e3c7d
font_01_sfnt_off0001928b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001a7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D1 11332 bytes
SHA-256: 820972fa0806d3bf1a0f894b09cc20f2f2ce471feb02423b12b10b9edc1c99b8
font_03_sfnt_off0001c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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