Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa34303c299cc0f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 04:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 608d157ddae2ba257839a0a0ace94f76 SHA-1: 26c93c308abde3b7deb647a4782af0b91214c928 SHA-256: 0fa34303c299cc0f177f13fea13f9c39636f5a8ec52f6ccd74368a4ef9cc3f7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings are sufficient to determine its malicious nature as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f123cfc75---56178980617.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4958aadb---xaboxi.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/novesatekakiwor.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/pakoxusevibu.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vobawojedeleg.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0ecc9db56---xofivupitokot.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/guvirokugaguwowumujag.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/14780023075.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/27255547314.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/53159626973.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/71167090518.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/49112136488.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ba563f3d925822c88c7433d541040513/29055715347.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/331bdf4f6a06689155e19a9eb95ca054/lojot.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9dc3aa89---fokexukego.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/f9r2d0r9ir953vk2hagrud0hdi/86647595305.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4420152e5---72101221989.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/wovivazozelewewaze.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d63101b5f12954d2d98555e5611404d5/88532569082.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/piwitupade.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/figajakefopejawe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a1f0e09e6aa9e039c670e75fe7e6bbec/48928259997.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/36366427317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=c+programming+technical+questionsPDF 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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 11096 bytes
SHA-256: ade704bdb4d4326d36dcee9f7a4339765649b609a32184094d4c689aa3c12e2d
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 16576 bytes
SHA-256: 02fd62c75c7e819cff40b153f1be54d059e4a12159940a42d2c7de00bb31a0f7
font_02_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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