Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8921fc5052efa2…

MALICIOUS

PDF

91.9 KB Created: 2021-07-02 06:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddf13508d3d87e4b9a0bb72b6590b43f SHA-1: 43cb191e70b4413aeb2f9b0dfccaf9383b7b4fd1 SHA-256: 1c8921fc5052efa2b6081a898e8ccde2647adec3468d0936fb652eacc6ecd555
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d403aeb3d7d---29019861211.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a085e96a4---23313152540.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jasaja.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/wajubapejujetajug.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715fba005fb---nupusewazuwifuxut.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75600daa4---37849790133.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/kexutumepep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/can5l92g0h5s19lgklaclplt11/15661080775.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/panevuvuweda.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/suzefemuwes.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/16589792019.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef356bc9a---midugusesabedimol.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/4317297694.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/zerob.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/depevubemibuwosan.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b271b90b483---mavodekibanumaxewutow.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fec906c08d957d402cdb481a29d647ea/84343920245.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6970c159---komuximasifamofafadafa.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fdeedf20---jitogarunizaxosisiwuma.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/tawawup.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eacf0dc85161b791c444407f8fe88873/labojejufixakopi.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/bimodavamenopegubo.pdfIn PDF document text
    • https://retta-bg.com/userfiles/zaxodazovinozarepi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075bac69a737---gagowututimexakapaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=8th+standard+english+textbook+question+answerPDF 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_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16700 bytes
SHA-256: 1577f26882ef43068e6ad6e1a4851678470a5e498d7a3138cb05630310ef0278
font_01_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 11304 bytes
SHA-256: 355ccfaff3c86cb6b3c63263acc277573ececeef8129912b95b30bb4f15e388a
font_02_sfnt_off00014a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1