Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9236be7355e1d0d…

MALICIOUS

PDF

99.1 KB Created: 2021-07-22 21:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5431503bab72ddd6096a8e4ed5bfad82 SHA-1: c9d8835219c9f9ec9c0a281b9de76ad5ad43b179 SHA-256: d9236be7355e1d0dde847dd945b116f975857396030339a90288c0895751dee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ec1006k3i6rrohkqt3drd6t9qn/vumodozosa.pdf In PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/33623096324.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sipasesisesisolilelu.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/zixusezabufekorigixat.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf542a9e4---jokigudaxafomur.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/5957547608.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/pufororuwovimusar.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c46648215a2---zaxolebuwikoluxunir.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zakotevuv.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/16617200873.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/41b8d04496864e6a018e3471532e9f9a/jisupawuwiza.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/selusat.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/46767547260.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/qfpr8njjt5cbj64a67te49chf0/34794345008.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/45553053077.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7a7bdb07---gosojagujiwigatawuz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2ecc59cf6f3b5a15feb92b07cac175b2/38155335803.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/70797041774.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/guxoxupasulazaludebide.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/jerawak.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/asf1j6s7litqfbfq1u07o6f3q4/42253289628.pdfIn PDF document text
    • https://aashianarealty.com/file/48265245174.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/40279338959.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13000805d---kabowex.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/pamokeniwelonilibaburibiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=influenza+vaccine+india+for+babies+costPDF 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_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10784 bytes
SHA-256: 4001acdf680e9193e8a94242a56efaf8a4192ac4d662ba5b72e98d25f032387e
font_01_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15168 16892 bytes
SHA-256: fd4b20c56911dd89e5524912b681ab5c2eb1b70974e7aaef88e8fa88f2f115f7