Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b8cb88b9efcd50…

MALICIOUS

PDF

97.1 KB Created: 2021-08-21 12:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c794d1eaa243dbc3f6ad99bf9cf1a545 SHA-1: 1793a093ff94581ede5bfc9573dc414185b7802d SHA-256: e6b8cb88b9efcd50839e4ee15cd91c7ea4b15a0e700f57250b174b80ac1ca313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL findings are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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 https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cfa7de9f3---rupizenimawabavibugofane.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160714116d0b53---jixafivabizadom.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/48840228360.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4783743f---gawuwupazutunim.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/fovopitufedoja.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/50593962646.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c4c84ded---josodujeziwunufojediz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/lunoteberalafi.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/detefemipelit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/f3bf79nktftdsga1jqg4rgnu6b/wirixazevivuwufujexuxaxa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/18606980291.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa334154004---similigapo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884fc419355---vewivolimadomeninuta.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/diwagu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb62878ed4---15849024309.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/tojozejonogofogajowanuf.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c337df3090a---61224466658.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bb58edf5---16484818551.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ctp7jdtv0nhrajdk9666uo8lp1/41319479274.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608784d7503e2---8389854030.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/1250446007.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b37ae9ba9---babunojinazonugusifoz.pdfIn PDF document text
    • http://orthopediedelft.eu/files/dirukufitomu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c08f2b1d08567d81829c5c465ce3d377/27750922876.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lazedukuvozatijamurijigad.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/61781018210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=selected+writings+and+speeches+of+marcus+garvey+pdf+free+downloadPDF 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_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 17292 bytes
SHA-256: 4a750ce182b837c3425ef8dc4c3d2366fd5e0e567aef3013d9fad8ecd58e9f05
font_01_sfnt_off000142ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AC 11508 bytes
SHA-256: 362eb2535d83b1bc5f986deab65c9522da054c4bf39c8b22d9d087d39e28a0c4
font_02_sfnt_off00015d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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