Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfca7226a0079e9f…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d4e19487013de37649b19c896300312 SHA-1: 1cd458e050acd8c6ff3138620ed7793be1a9bc2a SHA-256: dfca7226a0079e9f24ff2db6f877de42aa74aa6766538e5a0f992d2717af9215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to phishing or malware distribution sites. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=marxist+theory+pdf+download PDF link annotation
    • http://aucoindeshalles.fr/menu/file/vurizukedizunomutorider.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e0bb1949a50829ec3bf0f49b06837d3c/gemuwoxiwefodasivetitun.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/38286ae0c785379f5ad8a7974bb21f98/movopugajaval.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/baroletipasefudujokokab.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1c7ca97d---gozuxibazam.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a62902f2e05---29757784929.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/61664042739.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/j89gpt11n0ivvc6841i04ka65o/43100079486.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5airtbmbk3mnv9cljrrvkiglm5/68217915434.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kejonugojegifakixev.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86804170158.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787de40a7f7---wosow.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hijjgi3fpcap1s0tinh5uqa6b6/tinadorojabejego.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/sebatumil.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/81627293419.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/38cf2035c11940dded89c4b83f73df50/39244061742.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/27402607464.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee468513b42---94398725462.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/xejawejerodalalelifo.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/waliwizedamedurepiv.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/63713917114.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5bf4b46bc2be00f8d2564a59a1356232/40917230640.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e46f120a---puziwumiru.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_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10888 bytes
SHA-256: 7b8b38d14ec12dd680c53e65c080db0a153e2e5e86bbcf3d1c868445dba0f6b3
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16084 bytes
SHA-256: 143a2f2fb18e72161753a892c368693b937c0c818f93fad4c529c84636d9e2ba

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