Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33ccef4ee6f33ec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 549a129e06e7fd2ee82ea0f964dddc8e SHA-1: 434165be11c8f3315f6a178967d1d8237ac8f0a1 SHA-256: b33ccef4ee6f33ec077304fdb65b9e7a7ce7a002f40c3ecfa7392293e11b21d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=snapdragon+update+processor PDF link annotation
    • https://eastmangroupllc.net/ckfinder/userfiles/files/57724109926.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///49335663223.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1c0f08f78650ed2b8c96c82a0fb816d/nadenepaluwaxe.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///43447365960.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pimagunopugubenogonoraf.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/54223870603.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pogofifusonojawibuxadiwiz.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/silux.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/nagowerumeberanaj.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161527032e6100---16716498156.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614104d910ded---tugidabefi.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109081711222620.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/71269570414.pdfIn PDF document text
    • http://www.bash.cl/media/file/53660382470.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/disigel.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/57623448698.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143f586bc29b---bijosanudojatunekabula.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/69051138358.pdfIn PDF document text
    • https://seger.cz/userfiles/file/12341232544.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/12594296749.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/jezivatutogetumufuw.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161442432ad7a5---valojine.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/polatawixukuzefewajono.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/poxivinej.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/guxamutuxunirojuzizodo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/jititarajosekavumanuvajir.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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 10724 bytes
SHA-256: e17e87f4c3cc8d9ee058c08a88d5819511a93a9c595c7ff87207779931388620
font_02_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 14560 bytes
SHA-256: aaf3a56e19fd31745bb33a0936a451630a99d35461d0e39a21226be7b1a0bbb1

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