Malicious PDF — malware analysis report

Static analysis result for SHA-256 7041991c47b33587…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e6698396cdde1568dbc655987290a54 SHA-1: 3061adc6689245285307d79cf38e3ce09fcfc20e SHA-256: 7041991c47b3358745d9636b813fa6378054353c6f92e84ce5b79808fa698257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dinskayarealty.ru/media/file/89051335134.pdf In PDF document text
    • http://ingegneriarossi.it/userfiles/files/6248659325.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/xogositomifimavozo.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/remezuxowefugifa.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/18045904061.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/39198750944.pdfIn PDF document text
    • http://atrsara.ir/resource/files/gokalibanebudojodan.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b51eb73---wawelakivufegule.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/26966993591.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xurotaxeridikegilezonij.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/tugesu.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021942021564017.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/rebiderakokinefobiw.pdfIn PDF document text
    • http://mcutech.net/files/30970272852.pdfIn PDF document text
    • http://vuason.vn/upload/files/7114238432.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kugewewidasewezijexop.pdfIn PDF document text
    • https://ahha.az/userfiles/file/gemosukawa.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/gujederupage.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nilubuzu.pdfIn PDF document text
    • http://csp.hu/editor_up/bokebidowa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161465a58f104c---karasujejizezovosowutexif.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/19785961037.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/dinipuzo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ed7974f2871dae9b4265d21dbcb13824/77238755025.pdfIn PDF document text
    • http://snft.ro/media/file/nuveku.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/62367387536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=enviar+localizacion+whatsapp+androidPDF 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_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10676 bytes
SHA-256: 41fdee94913ebf7e6a7257345d398797951c86c245a4948c32a4e491d26fddaf
font_02_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 17856 bytes
SHA-256: dc46d2e1f5ffc96c535c0df29e410da2a697454c999e1da9fba4b8a6f256efb0

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