Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc0bd35ad79cf1a…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 05:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e60340b0055b60fe0b612f899b9ae167 SHA-1: 43c9f012f3088b2ebaa927fbfc099243b4711792 SHA-256: adc0bd35ad79cf1a38b6251fa02e8732169cd3b36eee014e9bcb2a7c2a77f3cd
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF document exhibits social engineering tactics, instructing the user to disable security software and execute a command, which is a common precursor to downloading and executing a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, and the numerous embedded URLs suggest a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://technoculture.cz/admin/upload/file/9951408651.pdf In PDF document text
    • http://brenna-ski.pl/userfiles/file/217179740.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5a3b6e61c31a383d01482538ea00f127/xagevuvorikap.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/14e28f1ef2c8db27f1d1121aaf266523/vadikipibaweseli.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/77088790660.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/28221962005.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e524f8ae---pemufilogodomujudesirojiv.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/ruzej.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/4943128562.pdfIn PDF document text
    • http://humanlitech.com/files/files/55488830403.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052612090770554.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bfb71bc9a70887807522ea3b10af56d9/45311012321.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/51832383423.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba20e8bef2---17506996392.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b5aeef68dc1a31dd9d8b9a0359368f0c/13674985865.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2746b40b---35246942094.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16074a79b66866---leraboxodediborigakozob.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a87d26535---mesajigamugi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/76d75e4ffa0ddd83ac038679a3e13e0d/tufalivofolusofovodivil.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/zusedin.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210609220133.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/59051636801.pdfIn PDF document text
    • https://termofriz.rs//files/bixabagivudu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e820d25---48940480355.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63aeea0c0---10090388539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+connected+no+internet+accessPDF 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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 17156 bytes
SHA-256: 72b38bb59385c779f81ac59ba5ef18611c5bc133ece567b944b3dfab71457931
font_01_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 10416 bytes
SHA-256: 3065b40aa1dd647bd513411d546ff82b6a6fa1569e2c11b1926b19084d97f407
font_02_sfnt_off0001387e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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