Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62c426d9fa7ba5…

MALICIOUS

PDF

72.7 KB Created: 2021-07-09 06:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e6958f23d9f71dc6140f948d0197dbc SHA-1: 486a2929011f818bcc4869f4a0fcf5a25e04983a SHA-256: 7f62c426d9fa7ba58b4b60a82f579b43f935b9854507f054c45f3dfc96d6e201
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://iaestedresden.de/userfiles/file/37375134237.pdf In PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/komumijoze.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xuzixusotezodakuzibugufa.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed2d060a2---65111136498.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3f8e44a3ff1090a305775e8613a6b1e0/94888298952.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210610154107759.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097b009bbe0e---3671058043.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/28312308092.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/kazenasim.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xazoropudenax.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/kuguraxowedakobevinir.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd71120a0d8---30869326110.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f19506218---mekunejagixasun.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/4340952527.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/67079411671.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/315f3d6cfe3ae6ca99e38afe9ff39c58/liwuto.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ff3cc61c32dfffabe362e28b824df8c/76392961424.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xapuborojirujim.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9tf33o49g28im4rt07khriafn2/nutivodin.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/tadusikatuputiwuzisol.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jofj3ja7ad6fppl30avrs772s0/lefezeg.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2frvcf8uh4ts14hqctn157ffg3/31414261913.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/4892200738.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcc73f2ff---30902711681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mechanical+aortic+valve+inrPDF 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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 10220 bytes
SHA-256: 2a8312ef79943743e47028c63bb1ada3c8b976e2ac7028cc6125424c4a6b84e7
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 15644 bytes
SHA-256: ae36d95e99bda50e23cbc099aa5a4e66a8d0ceebbb3fe1b730e1da9fab84279c
font_02_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1