Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18e44353bb97ac1…

MALICIOUS

PDF

96.0 KB Created: 2021-10-04 16:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f20d64910e0c3f1cbfa3c726ffc34e00 SHA-1: 52237ee9d33db095727bf86609b1cde0eed1fe3b SHA-256: e18e44353bb97ac144ff7c6975bd7e273d651311cd20aa5b24867ad04d9a2c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://netinflux.net/userfiles/file/siparupubonen.pdf In PDF document text
    • https://holcom-solar.com/webroot/img/files/zusazibenadola.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/botasupesisukoni.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/341459630f4613b50ed222673b7a0a2c/11241776215.pdfIn PDF document text
    • http://ccshecea.org/upload/files/konijejosorepulugakazuwuv.pdfIn PDF document text
    • https://mimpishio.com/contents/files/82929881004.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/zokigedizikifoto.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xajefakogawo.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/30238039825.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/palupemufekosowuwub.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/palaj.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/zazukepunonaxuzidixiw.pdfIn PDF document text
    • http://lulanjina.net/upload/files/40879417250.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161517d027d481---pijaxolovutabejuxukowodix.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ujv4pevcjr2g9qdf2ilkdegv0h/wuvamabowiwukexov.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/b1a6e22aa330e01cc45638088e62ec50/pepod.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/rokigoxusese.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210903082742.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/27135463943.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/32847994291.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/34124512171.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/78616802818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+shiny+charm+let%27s+go+pikachuPDF 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_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 20584 bytes
SHA-256: 1529b9a3bad3d0f2711888d0af445f5d9a23f324696b66950d8eadec97461e2e
font_01_sfnt_off00013fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDD 11240 bytes
SHA-256: 790ef2b067153bbd7a4edf9b2678b73c345aebbc62a8deb4022b6988846f6262
font_02_sfnt_off00015a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1