Malicious PDF — malware analysis report

Static analysis result for SHA-256 95551443e812bd4f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 21:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78146468ee8589fe1bfb5db3a54a35c6 SHA-1: 652cad74475b48d4fdf2432747e1e9c2578f438e SHA-256: 95551443e812bd4f4d65eed2f1d5d32deadb42c78a3ecb4cb5f2db40436500b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and link farm heuristics suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=how+to+clear+storage+on+android PDF link annotation
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadezoxixonuvevelotofam.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/81173710072.pdfIn PDF document text
    • https://mkart.it/uploads/file/ninakerakikonoriwepebed.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc466c0df2---lulidinanek.pdfIn PDF document text
    • https://profm.hu/files/file/35096434001.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/96350616031.pdfIn PDF document text
    • http://ehlibeytalimleri.com/resimler/files/zoziluvagisatamomivexorek.pdfIn PDF document text
    • http://lean-ds.com/upload/editor/file/befesofivorumofuruna.pdfIn PDF document text
    • http://friulanapanini.com/images/file/48820606900.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/46083471337.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e7dce4f5cfce66790b48eac709b484e1/jukaxafuwilutenur.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/22706803448.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134925e6cc49---70844091555.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/juxitovodokoluwasosilod.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/rolapetazosusevi.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/filiwexivopegojoni.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/77371466085.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2a374fd0872815a41b14f3ec3fa05a85/787919392.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tozevu.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jokaxizaba.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/wafivulesomolizowamipuda.pdfIn PDF document text
    • http://davcpundri.com/css/file/vubizazobopiwafes.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/48176809867.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/181449142165.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/kapadumonebepojo.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 17056 bytes
SHA-256: 920034c1456af4b06bbc27036a8d72d290109b155317da758e6b0ff90660607e
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10624 bytes
SHA-256: e4ed3ec364730ca91918bf68cb03c065c1e3b5829f44236e58a271fc75fe7f18
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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