Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d426b35bf323bdf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 14:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f286c75aedabdffa388bbf45cc972b1d SHA-1: 9bd778b181bf67b0dbcd5f948bab338b8fff1020 SHA-256: 5d426b35bf323bdf4af7013234bae05834bcab9d67e08790bed50791417d6697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=rayvanny+new+song+2021 PDF link annotation
    • https://officialbacknumber.com/editor_up/busavedidekakulojotov.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910235231.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/musutipoginuv.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/24313477875.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03d58d9be---fofixegikije.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918063657142397.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/97617521216.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/adbdbfb6831a8945f28e3fc9270cf3bb/bovabuvekefirolulope.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/28457e37f1794b9b6814954409d2668f/xukerafekirekinez.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/eb48699de2fd0ca20414059eaa36c75f.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/masawunu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614294a32a472---71907573241.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091015440473499.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/wilusitujupemezovo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/pedaluluvaz.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/66684294ac3a2688046428b51222e240/26156229040.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/26428073995.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130276fe1a53---60644122161.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/31350758880.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/69151510892.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d4f3f33e221325b7704f60bfd4db1380/xebejoxiruvasojomuripagi.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/3923388860.pdfIn PDF document text
    • http://langmypham.com/luutru/files/13582995838.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/puvatemibolena.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 19172 bytes
SHA-256: b2dee44444cc0ceaf129c2b655e00c27a07f9723c1facd5de6246aacc78363c9
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10552 bytes
SHA-256: 8b7f01cc4e3b9ca47c367b79219cba1988cd6d4a223f3c3f45c32ba8de2fff50

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