Malicious PDF — malware analysis report

Static analysis result for SHA-256 6578694193ee9cb6…

MALICIOUS

PDF

89.9 KB Created: 2021-07-03 19:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 457a586fb84e53206ff7517be62fe49a SHA-1: 027f0c00121ee28f344dc64c9bc39daaea510db7 SHA-256: 6578694193ee9cb6b981ea229c4db7b3a2485fe5903249b13f060d6379c1b0e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious PDF designed to lure users to compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/86d8f7d94aaa5a0d465028113f2bf5fe/fomosix.pdf In PDF document text
    • http://waterreducer.cn/d/files/kaxanakamosa.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c3df7b0f2ed81c048851f8a4f6263b74/77459966660.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fufizerevowakivumujom.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b17329981---71645305111.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290de6c312---6962227490.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/te8fd083isl8783cg77kke4cpb/dopaxef.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sizigegarovar.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/18931746402.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/49566777730.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xukutilude.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/bebof.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160746373b1916---49691448459.pdfIn PDF document text
    • https://ahha.az/userfiles/file/ripoma.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983019c79d1---68315507521.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cf024cd7e99410d6feed8f649943a80a/pugogevukivisaletepep.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cd2b8131caee6da190979d359469674d/78724534820.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/gufotejisinafadu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99102dbb6---rudavi.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zividuzi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/69995569262.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c9e5368c19ec80826bfb260363c39c93/16348678687.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/32254290033.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ko3uta1gjj5m5ug6ejombbol1t/40832867317.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/23853325279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+wings+of+fire+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10728 bytes
SHA-256: 4c640b789370955a120595de1be09c3186f76dd14358052c8f78bc0d6707f5e0
font_02_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_03_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 18252 bytes
SHA-256: 9d2306718f970293b03861db8e6b581cb184ff42bfa01a538b0190b604d31272