Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a18e9d27286edbd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 11:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e6aa5b7685c7c0239b196877da46d21 SHA-1: 974464e556e42749a66627636877afe253305849 SHA-256: 9a18e9d27286edbd24a3e6c2acf2b4f706d1fe53d3b9c66fdb6af28244fa7039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the true destination or host malicious content. The presence of external URIs and a link farm indicates a likely phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ingmarcofaedi.com/userfiles/files/1884321728.pdf In PDF document text
    • https://makojudo.pl/zdjecia/fck/file/jetaloludogegelesisut.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/biwojoxebipa.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/8668451259.pdfIn PDF document text
    • http://w-mill.jp/images/file/26389423824.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/mawirelipije.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/5956964995.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/93863796030.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302c79ee6c6---214451203.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/fafakotunupedazunojezi.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/61443941242.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/remen.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161515611c3567---6284960409.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/26838863549.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hutefau918tcp8ijuv243u4155/98053155179.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/goxanugujijin.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/nebimonoza.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/50837638480.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/zewev.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8da463c2be62262f4cdb4c85beb062dc/95991970897.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/zarojiwuvadiwudo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109100705448476.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sivazepibis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+free+robuxPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 14988 bytes
SHA-256: 82444f1730766e9a80e0dc1ebf0a07fe21ec8377f4951b70ebdf95c1373109cf
font_02_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10236 bytes
SHA-256: 0bd21399323a0069bb21d563b80432af2889935006fb57a1ac30bb8619c638c5