Malicious PDF — malware analysis report

Static analysis result for SHA-256 65eb6dd25564f2e3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 653d980e53eef423a8d4afa8833ab2d9 SHA-1: 20a2e0d00663bd614b7c944ba96c89a147c98b24 SHA-256: 65eb6dd25564f2e3649cb9faa08dd56874011cbc670b2fdde904b97fbe6385ba
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://leifs-auto.dk/images/file/83001308809.pdf In PDF document text
    • https://everestart.com/images/stories/file/fepabugonadis.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b677c0ed5---91301536528.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i9gfm3io26im6d6f09736aulh4/98993079328.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/dopisufilu.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/folibenumaz.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/68364196805.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/80258754340.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/13475693927.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/fizimofimirivigomowuwaw.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fakimibabosomatixalabeb.pdfIn PDF document text
    • http://signauction.net/userfiles/file/22277625854.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/70190865777.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/80d568c35b2ed5a7a4c20d7833dcaa5b/girowefigiki.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/8338097805.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/julaneriwosixumofefalexa.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/21920513069.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/38024144340.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/64172808233.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/30135107421.pdfIn PDF document text
    • http://dogable.de/userfiles/file/gisiwakus.pdfIn PDF document text
    • https://zzwgjx.com/d/files/roxoxav.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133913e99f95---38309206471.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/32307295949.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pozaxalulanaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hack+phone+on+same+wifiPDF 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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 18540 bytes
SHA-256: 459f0dff82660e421444233d6635261187c85da905e34d8d8534dc293bc75f88
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 10672 bytes
SHA-256: 1e439d28956292a11e0c0f0ae4b92eaf535e4282dc2142af2bf929d75f8046c8
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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