Malicious PDF — malware analysis report

Static analysis result for SHA-256 423047a6316ea1fa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 08:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae4ad8065cf6d11db7369b0a55f6a8e9 SHA-1: 2148a2d99aa43789c7897713882fc639ed8e573d SHA-256: 423047a6316ea1faa7b477512eab1e80eebebfab182695ef492914769bf07bcf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a lure to external malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://derechosenred.org/aym_image/files/13705441519.pdf In PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/65099405694.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/wunonaketizokuw.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jivube.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afed96643b---torirazukebipokaruxot.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/badifazufap.pdfIn PDF document text
    • https://vestol.bg/files/file/89055620899.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/5751552961.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/23981917097.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/dowoponunem.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/71822616761.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/gezinunanadatiso.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d68c413c---87024300172.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_016BDEA936BA52A8.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109052114261536.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9e6e2da5---37325007453.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/xuriw.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11289f01debb7d4a6ccdbd2de7b4763f/fenejetugezesatifefolozef.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/96901609796.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/wuparuxij.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/49238179625.pdfIn PDF document text
    • https://digireg.sk/upload/79555602786.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902125809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+apps+update+manuellPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 17932 bytes
SHA-256: 253abb54bc123e0a16e3b8a927efed256d879ad9ad2e6b7217d92ecfd5dd2ecf
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 10636 bytes
SHA-256: 12b01aa0c6f55b975d0f7eeaa774762da411ce0da7d5409cfe56157fec649097

Open this report in the interactive analyzer, or submit your own file for analysis.