Malicious PDF — malware analysis report

Static analysis result for SHA-256 945dc00ae0670e03…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 10:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c74ece467e699a5acb94d7f4441bddc3 SHA-1: 076dd1c74a9282641f6ba029fbc7c7a06c17d8ae SHA-256: 945dc00ae0670e03e8c4ec31e1294cddc6787f6bd842c80956fee194797aec97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/69795662524.pdf In PDF document text
    • https://madeinstlucia.com/userfiles/files/tesonanilotivipuvom.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/79122035018.pdfIn PDF document text
    • http://www.moyekolodin.com/files/beninelatiruxurenete.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/51645798338.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/dogewirirukux.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7f3bcd28620f300b1fb8e31892e9c1a6/koduga.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/nusumopadamasixunife.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c746135929---vutuwajilerajosepa.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/98346660318.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/lawozezilapa.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92918435373.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pakunalovatetifepaga.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/besarotamelatuba.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/jizorigot.pdfIn PDF document text
    • http://zzweien.com/d/files/40387559249.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/49787440645.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/32173568496.pdfIn PDF document text
    • https://tekmaker.com/upload/files/38209174281.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/sudakirufapuzeleli.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/010755517624.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc2c27045---tumulorolumoziwiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vice+city+apk+data+downloadPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/30318576682.pdfIn PDF document text
    • 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 17000 bytes
SHA-256: 2953748e841794b83a28c12e290fddc895fd2a03b7c3a7ddb6f5c63860cccdb6
font_01_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10500 bytes
SHA-256: d80c728013b229aae85731b93e83bc4ba9586f4819fdcf2dd29c39e85d09db5d