Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c5fb86b9d3fa51…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 16:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fcd18e17fab77f48098ffe36e309adb SHA-1: 10a2cc14b0fd2c2a31db18f885a481a4554224f0 SHA-256: e9c5fb86b9d3fa514e6a3a12c406f086aaedd48c4a2bf0e8b9c073aa3aec1cef
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://a2designbg.com/userfiles/file/97328123575.pdf In PDF document text
    • http://vladekoservis.ru/files/murozegotukinapunodibafo.pdfIn PDF document text
    • https://binhvi.com/upload/files/fizoriwimuzupamu.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/figuvab.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/38026559995.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/lojuwafuto.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e9f569061a5a456445126c7b4608d8ec/73611178087.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/95631482742.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/vaxoxofed.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kekobofijesobitak.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/lufiximep.pdfIn PDF document text
    • https://isosklo.cz/uploads/19956665891.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/xejogenunowopolopad.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/39ae1o9ktgok58i1o2ttos8hk3/45150599919.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/28ee0ce7b3a06ae2a35142e7164340ce/49144520525.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/8330741394.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/48923003009.pdfIn PDF document text
    • https://onecre.com/images/content/files/97018556521.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/zapumidonel.pdfIn PDF document text
    • http://spakimthi.com/upload/files/84124364418.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/juvekexaruf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83062204659.pdfIn PDF document text
    • https://bawauang.com/contents/files/jitatewewel.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3883dd92---fajepijumo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210906104556_7pugig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aplicaciones+para+descargar+videos+desde+androidPDF 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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 10640 bytes
SHA-256: 663ee6ed0df7142f14b54441a2c9938a09878259f4deafc12cc430642e962396
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 18288 bytes
SHA-256: 268157c3492a2d018e0eb39dedd05bd055771ae5dbb7c2220c0586451c635718
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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