Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaaddce8dca72f9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 18:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 863c056521d28b617f78ee6818727ecf SHA-1: 37172bf1ff49233446ee17ff29c5d1ab43f57d1c SHA-256: dcaaddce8dca72f9fed873cd28063f0bfbd72d8b10801ccb5f90fba7a7a358aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://studiotecnicolari.it/userfiles/files/99126798462.pdf In PDF document text
    • https://eklyps.net/images/file/83643578991.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/wunabukosaketozelejo.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kozodowez.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/91163849689.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/33943041068.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/24826511848.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909065635689053.pdfIn PDF document text
    • http://blueyee.com/upload/file/110231554108.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/15080525121.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/13806011248.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/11824742650.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/60424073635.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/miwiwikejuwo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zogegexogo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/kotipubijumexoguwologat.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/76490991796.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-11/20210911201134809374.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/88731264813.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bch9d8hs0md6dap17v00v38f55/buzamiweti.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161333b8eb5e82---91508177902.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/45092741268.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/87019781257.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/77643526454.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9e1d81a8a---fugaxafumugezakefat.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/godejukurezobuluzen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+ashPDF 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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 17604 bytes
SHA-256: dfc190cc03e9d9a665c6eec3b90db88e9aa79469751867bf8a0240e8945c9cef
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 10048 bytes
SHA-256: bfe29f2ee875ebc847d59548fc0224a3e45e6d9fd59df2ff2964aa3dff1369af

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