Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad81f3367801a8f5…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 01:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2dd02dc77a66c21475473bf4b63d005f SHA-1: 9c0cc73066a5a6330a26da7cd1c44806d0ac272a SHA-256: ad81f3367801a8f5966f7941439f91fa762e3272812257b0f4de8b129a5e5e46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=score+hero+money PDF link annotation
    • https://winpoasia.com/ckfinder/userfiles/files/topupadizalazogilimul.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091616261973499.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/zazekizawix.pdfIn PDF document text
    • https://drlanda.hu/user/file/62646062931.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/gevixidi.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/binuvojipemibovabazu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/63498381042.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410637a042b---89498707974.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/3260839491.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/fogefugukunejenako.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lepariwajamisoniwofileli.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/131bdaeb201baa37be9229c3e9553cbd/5588616849.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86023582298.pdfIn PDF document text
    • https://cristalensi.com/public/File/40876040505.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109160216324224.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ruzunafil.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143c28cd8e97---518552394.pdfIn PDF document text
    • http://cudicio.it/images/file/17335963284.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/83965647234.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161450306ab5fc---94040739407.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/nojebenidimeripigaz.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qm6nk113viuv03kpkg0bn1n6d0/63624575840.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/32149020316.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24064751486.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_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 18484 bytes
SHA-256: a9f9ef8c447b496e09865790912170fa10dab12818723fa0e7094fec25f9b0d1
font_01_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 10116 bytes
SHA-256: f8b0309692397f81afffef128e1c81453f4d465a144a7c05b3c67deb5bcd2fe0
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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