Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32051d6268bcce0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 22:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4cb2f07aff186da9205d69d365aefba SHA-1: 8602ae08f038918a63be328ae7e905c56624e4f9 SHA-256: c32051d6268bcce006883789c17dbdf2c21f35b983f0efab86d9f1206491152a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

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://inwebjor.ru/uplcv?utm_term=utorrent+search+engines+apk PDF link annotation
    • https://xn--nmqu14inmf.com/upload/files/48815709582.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/72755781282.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/14q6b30s7t8cvrg9094dc058ci/tugoweluzajonoxekekaser.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bavemo.pdfIn PDF document text
    • http://faradbox.pl/files/file/33864560469.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/gulofonur.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/2792315782.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913233001.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c270f27429d6670cad4b1fb8715f6403/29825157940.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaea8602c---reketo.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/6829183093.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/fekoze.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/dobositikona.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/kupewek.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vasabetubexatejasagojud.pdfIn PDF document text
    • http://ucokampen.com/media/files/13501511643.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64676f9ab---luxolojomufupokebas.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/16460973624.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0971744cf3154e2d0f9e9db2274d1aed/25930101971.pdfIn PDF document text
    • http://word.mn/uploads/assets/51202795383.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/73642129923.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53645947493.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210904104931_ur3wda.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/burorunoxujol.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10708 bytes
SHA-256: bf8772a95b6f4861f6987328f395280ed207631da09140e63f7117bccc7d0029
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 17648 bytes
SHA-256: 30ef6e26def179f397a3d5cc95420b32f43ca665398497c7869831942f4bacbd

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