Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2bf87f9fe759a1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 20:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ceb3ebee111457d9d62c7775a2e80eb9 SHA-1: 34313bcc94e33fa5a1e14cd1f4af8e635939f7d2 SHA-256: ba2bf87f9fe759a1100a52ab2fe41bd1d7e839748abdae4e3d76aa692c9a261d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=gta+sa+hack+apk PDF link annotation
    • http://swissies.lt/ckfinder/userfiles/files/kizekakafakidin.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22039467242.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138283705d89---wuniwi.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/43800775779.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/zuvotosizobuvujufesa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/60d6ee7ff0b4b4062df4cd5e61425860/vesed.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aa482a7f5a7719c2db976e044d072b52/jesanux.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/82764330091.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zigupega.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/matuvinexevebokakakamom.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/56855778526.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/komusigasajupatabofubidi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/fuwixinotasajavigama.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/sitokevadanimifapunemoxus.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/12971954732.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/73370483579.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/29316873202.pdfIn PDF document text
    • http://workontext.ru/media/file/zamupebu.pdfIn PDF document text
    • http://186086.com/upload/files/minubewosu.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/jugisasivofadajadote.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/5395926701.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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 10008 bytes
SHA-256: 3fefa93f8940645ef72656f4674d327e266914e885d59861bfe90eea767054e8
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 17908 bytes
SHA-256: fc40b728b8c7d7a94a0b9107475ef07486821faebbfe6c7b51a5a64552829931
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1