Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a07d912cd0bc190…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 16:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca45a14d48507ac736b29111f52e5ace SHA-1: ea61b84ba40a74e4149c85479e4ee00d5d384754 SHA-256: 8a07d912cd0bc190350f3621255568fe35095b3130a5ac03e3db87bc22a3b9a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external resources, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ottopianos.nl/files/jefoku.pdf In PDF document text
    • https://aradovan.com/userfiles/file/87039663704.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/49323735796.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/49453193902.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/69241293879.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/71582355901.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/609626544.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/72878228960.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210921033706.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/tulejozisusuxujijovomevip.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/rimegevividu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/26207694845.pdfIn PDF document text
    • http://orlickachata.cz/files/files/sibuxatejoxivisipuwapawik.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/26479485864.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132405045ccb---fusivor.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/37873861654.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///lusewufajixibilopisixox.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/siguliwasas.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/87848038012.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140224b5a0ab---81631945172.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/67739267210.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82fbda21e---95028421947.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cfqlts413labdr6tnrq9jkbs91/21884631335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jeepers+creepers+4+123moviesPDF 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_off0000c2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C8 10604 bytes
SHA-256: 89295cf525ca6a08b16f15838ab9bcf8c943b5a789299aca73c8eb8fecc62201
font_01_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17804 bytes
SHA-256: dc1e8196444b7a099a11784b410b38f960de3d31450be1172aa7fa3d8e25540c