Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9745cc7b74c24d0…

MALICIOUS

PDF

63.7 KB Created: 2021-09-05 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fca2d8f3a5e8d588180029ad85476f45 SHA-1: c641e627a760575030377ccd996ea2079ade09b6 SHA-256: e9745cc7b74c24d0c90ac9181d9ace3f94e057d810bb466f6c4fd22a77fe169d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of links to other PDF files hosted on various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' in URLs suggest an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

Heuristics 5

  • 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
  • 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=9th+standard+tamil+guide+pdf+download PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b30a26124b6d7444f6b0aca0462cf6a4/jafolepurovebis.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/muzofiratidofusegobesad.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107230241481537.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/28874995209.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/203c98e5990a9f0feb33a22c20000aea/masobuxagu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117333625d7---gumenixexami.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/kanatapenusolotosufituj.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/63568259163.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/38201532866.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/3501195563.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/85413860235.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///67620433451.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/duvelatu.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jakelogukupigi.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/namije.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10fb84618585349435182e52334ee0cc/20065843766.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607366042332b---vigatoxiligasasezos.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea8c4511---wukutasajexujex.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sufikox.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8071ed9ad---povavawusizop.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/42191522410.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xipirekawolotidezololil.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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