Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3efa229581f42de…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 16:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f206e276d3d39a91125b0c7db187ab94 SHA-1: fc6abd4a15659cf8e3a4e4bc9c70c9a1a609a8a5 SHA-256: c3efa229581f42deeba314f479b5426997e70fe99145b22e0b476f31da6424c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised CMS uploads and disposable hosting domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://fge-service.com/userfiles/file/93006589187.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c8af82228afaad01f7fa4fbffa2b9ded/9706153266.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c0ca15cbf14365b07b6f2ebaf520bc4/96420064754.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/luvinavizixibede.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/16501348691.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/rimebijafejipeverarij.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/24417740180.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sakoxune.pdfIn PDF document text
    • http://popmetre.com/news/files/54933876904.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/simopobibedizu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/86225911485.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fogosadanikigakobubu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ff1aba4---gijufunepezorazoxajul.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sediga.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zusos.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/95596518380.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/rugetuvaviwaxidalenekujo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qvkc1n8998evihuld0mn35ls3v/86193593426.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/42951057698.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/27807046598.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/43373800256.pdfIn PDF document text
    • http://vanhacollection.com/images/files/56420305953.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/jotegopifurobesa.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/87458162388.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131b87fdbe03---kamudemaxozatageleliragi.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909152754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+promo+codes+for+robuxPDF 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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 18488 bytes
SHA-256: 3b8d5d027d69fdfef8145c555713d757b59d4e32165880cfe7b8c0f288292b93
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10596 bytes
SHA-256: e1202cf65be4858f8061928f4b733b73688b6e60173fc042b615d401f41e200c
font_02_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1