Malicious PDF — malware analysis report

Static analysis result for SHA-256 217f4be8dd736dc4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 07:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f57a06c694795eb03597805fed4db56 SHA-1: 19b65c11135963ece5524b29c0c77d19f2741580 SHA-256: 217f4be8dd736dc459385a5f90e8ef3969bc3ae7767d196cba247e0904ea3198
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ikincielinmak.com/upload/ckfinder/files/muxujezukabomimoxatov.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1e28ac32---32156215783.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/tebivakajumuzedikopodasal.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/29411494436.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3ae93216---tobumosemaso.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/37910042696.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68863837895.pdfIn PDF document text
    • https://unaizahic.com/Files/files/90182768218.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/68102872212.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/tapubusakogajexiv.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/gijovagafenijogogekuziju.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/golufobuberonujop.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zirobusanokudonipi.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/somixikopetane.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/80895420841.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/sadifew.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb870f8be---29843658400.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/moxiduvigowa.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/32922221562.pdfIn PDF document text
    • http://tochuchoinghi.org/files/42825967109.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nrka3e0hhnp0htuoh5injjve45/71589218345.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/penotowevositodilororan.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3ec22b89---lamawozonarawuvoxuxereb.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/10520552402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+harry+potter+and+the+chamber+of+secrets+gomoviesPDF 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_off0000bae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 16196 bytes
SHA-256: fac66967ff3a0bf24e7d35239e1d20d5dee6b0792926a1a913bb02e261a58a27
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 11332 bytes
SHA-256: 265dbf563a2c8941c82d3c47e9acff61e0b9411f571e544c55866f870582a7d6
font_02_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1