Malicious PDF — malware analysis report

Static analysis result for SHA-256 971c4ea485aba648…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 15:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9588b01c9272ec2d5544907382a05bc4 SHA-1: 2384cb1378c85fc079878f2483f56d087aac7a5b SHA-256: 971c4ea485aba648979194319ffeb126518c9db2a2bc5bf6caaa0fc3cdaa608d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://hoangle.vn/uploads/userfiles/file/22141918197.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/62338366298.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/gixevubogo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c8ec97c405f62e03ce9b54c98d9311f7/zeviforeze.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/142bef068490ea2449d4fd6e014c690c/wimalujotupizazu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/walepomuxaxuvuke.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/e3e50e8ab3a1dee065463270e1d9eda3/fozufomozexoridezesoponom.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/kagenozajede.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/25793171798.pdfIn PDF document text
    • https://nistd.in/userfiles/file/17574207687.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1056811c---daxarifuverunuzogovoxazom.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nhs2toslsflh2e5mj96j9s7md5/7231242089.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/81471953042.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fobejaxajabopexe.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceabo3uu23d2aqs09lk18gq4jq/69471246984.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/sovogi.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/raxusixupafemarila.pdfIn PDF document text
    • http://agama-rc.com/upload/files/49883133014.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d3f934c4e3---gifemokevebizubozuxufuxo.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/nukopagabezinano.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/63594815554.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3845d98c---68532477152.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721e2ad978---fuxomed.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/liwen.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/jewusunek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coordinating+and+subordinating+conjunction+worksheetPDF 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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 11184 bytes
SHA-256: 27e3a19163b0f27dc5c884752595d0f5cbb692d40a628970f07b73231758833b
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 19552 bytes
SHA-256: 1940bc3d9c78d124162af334c4b3a6b8da525f9dd730bb428eedae4399d124f2

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