Malicious PDF — malware analysis report

Static analysis result for SHA-256 6458996d7edb73c1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 17:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 082f035f80cfc1a68ebf0a2e40923bdf SHA-1: 95ece55ab82dfdfa5ebc5cbf1d4b178aa45d188e SHA-256: 6458996d7edb73c1f0673c765f2e9e93258cb481bb6d479deea8dbe9f5bf41b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://5thaveseniors.org/userfiles/file/61140384596.pdf In PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/80746810187.pdfIn PDF document text
    • https://virker-ikke.dk/files/29142683013.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/58000415694.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/24593731555.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/v5pmpujh01b6ac5v7ubqivm9qt/32634333448.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/toguwapun.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/merasezurulotawubuf.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/64019075965.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/xikevidijimejarawobaj.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6d5bcec07aa2b2224cbc278ea89ec85f/dejeleka.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/zavudutuzanikowawanixi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1624884418989.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/1239162174.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sukikutigedajedosi.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kasakijizofutabumes.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tulifujawatosisufexomasez.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611148cf3bfc0---48401021203.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607506f247709---fodaduminazujapawiwubixob.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27fc2b8f4---senapukofare.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/18575520797.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e7e94db1---99880048434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pte+essay+writing+template+pdfPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 17160 bytes
SHA-256: 51cd3c143dbf60dc54ed892db4ac1ce42d67e187fcdf30657aacc5ae3b32f1aa
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10924 bytes
SHA-256: 4c1737a6ca720750e218fa1e94363f02e45a08481a2ce5c1c9b30cee1dd349aa

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