Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f832b1c53607cb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 10:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01ee0d11e1bdef519050f1431c3cbd29 SHA-1: a34c22c1455363a260663e21d21e980e26d6ac3e SHA-256: a4f832b1c53607cb4e603262145b60628deb524eff2e112649ba33f37cb80fe0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5u51nal9fk8haom2hbjl8v1um3/kixemugibapato.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/xomufotojajidodibejeza.pdfIn PDF document text
    • https://senfina.top/uploads/files/nulaf.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f474e146a---fipale.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fe049d6---kigadabiw.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/45880808664.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pawemisosekad.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/latezofosiwupami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e978cecc---7123736036.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jinutavagabudujisaxevar.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/gebivokofonavipumupi.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/navodipaluzaz.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a75b7825---tituwagodusoleke.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/xivaru.pdfIn PDF document text
    • https://breedlife.com/upload/files/42926428944.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210915_162630.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c971ed1926---31747154091.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/15976835365.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/69447699077.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbca69a05---8708307866.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/61831424496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=auto+touch+clicker+tapperPDF 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_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10372 bytes
SHA-256: 4ab23472a4e0bf95b203f8e1a4f1da9fc20c535a34ab3a9076484b65924fb0b7
font_02_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 18052 bytes
SHA-256: cc93f3ac2abc21adfa2a2b091cc763d116d3ac29a4cdbe368aef89b947e5be2d