Malicious PDF — malware analysis report

Static analysis result for SHA-256 af42d94f35981c72…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 09:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ffe18976a1ee18ee4a306d5655f0319 SHA-1: d1fa905a9a3dfd3b56b618342c8c2d4b582afabd SHA-256: af42d94f35981c725e1da3ac51238d53ae6790a692cf558f2ea6f53a94d0cc53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rentaruedas.com/files/others/wededoxozelowejarofi.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/56709650318.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/50258896732.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841ca58821a---82416313980.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/36423862750.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/fuguvomasovisizamugadu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610313d7b3886---gilifuma.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/97beb0928eba5a7d8cee3699d95d932c/2663232653.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700254c3d07---ludalokifuzawilem.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7nth0lr7lu8og0mnqesbisnuss/66833652873.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zebibisironigegovo.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/zagegapenejefawozopelibo.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7faa16497---vulofug.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/nafajulibasaj.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/30417797817.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210704_41AC48A0F9768C71.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/zirebaradasa.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/bowesuxozolamamamizekavir.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/26208439231.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/puromifuxobuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=%D1%82%D0%B5%D1%81%D1%82%D1%8B+%D0%BF%D0%BE+%D0%BE%D0%B1%D0%B6+5+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%81+%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D0%B0%D0%BC%D0%B8+%D1%81%D0%BC%D0%B8%D1%80%D0%BD%D0%BE%D0%B2PDF 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_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 11060 bytes
SHA-256: 528de4512d0557100a30aca5693acb9db5a2fc62c377cdf2dee2b74d1a51ca5a
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 21536 bytes
SHA-256: 89e2444d1e2267181a52408da3e66cf51cbe57bf9fe84a63dad0e5d8d4a757cd

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