Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1a771f492c7c78…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 14:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95d55688fe1c20f6f7d31709591e9d8c SHA-1: df226399fafa7cd205ef5571628dc20cb685b8cd SHA-256: 2f1a771f492c7c78816faf74030025dfe16986e83066128ea0e11f26b81d12f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying a link farm pointing to compromised WordPress uploads and disposable hosting. The document's purpose appears to be directing users to download files, potentially malware, via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://kosmonautika.ee/ckfinder/userfiles/files/96544021021.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/793469c0c42b1f8673c235217008932a/kavibesiwo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f0e0cb01---xagodupuketisedotaresovun.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/67795106529.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/12590161970.pdfIn PDF document text
    • http://creationart.hu/files/file/sowikofa.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/60763085929.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/41276313787.pdfIn PDF document text
    • http://grafitym.kz/files/file/wunilabopebetemumi.pdfIn PDF document text
    • http://yibetter.com/data/files/tekenunimevafoxokoji.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/gasaxowoduwadafik.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nosomituvafadu.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kewewazum.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/xebugetixikopaketi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161328abfe1c7b---makotugawisizitubumozel.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fccc6c05c---5498323242.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcee4c1e---40516263377.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/4463212024.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/salukefogokir.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/pufanoj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb640d4ee---lugazufunifaval.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/xexavawam.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919173644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+mobile+apk+download+new+versionPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/64719416243.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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 15556 bytes
SHA-256: 73df156c8f5cbb932434ae76f41d498eeb7e81e5639c542388a57fbcaae89042
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11124 bytes
SHA-256: 0104083185ff9f55cb8649992e715b0e3b1a946e69753fe24582f1461ce52227