Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d617be27501a6a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-08 06:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 481b7d3e356e35734538f8560301fa9e SHA-1: 4df59ec638890c4278afb600381c79e0c83e498a SHA-256: a4d617be27501a6a760c37e1c8ea52ab24728cd04daa6d199deb2f4f45411e5e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple domains, some of which appear to be compromised or disposable hosting. The presence of a 'download button' lure further supports the phishing attempt. No scripts were extracted, but the overall structure suggests the intent is to trick the user into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vinag7furniture.com/app/webroot/files/editor_upload/files/wipoba.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/44611399412.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608502e7d63ba---31442615968.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/12897730606.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210619_817B9528CC8489EB.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/b4q8qk1dc6j3f7r5bet75ke901/21865571107.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d685cb7db7---zarivolufopizekuzelifu.pdfIn PDF document text
    • https://coluer.ir/documents/file/dorirakesifazot.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37bf34ffcf---37798066057.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/dccfca88b89bdbe1fa7f35d95f3f3497/lirebegemes.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072a41352448---zujos.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e489a45ba15e71b9674b74d5c82fe63c/64233512976.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d256c3bcd0---midajiterisilatobafunip.pdfIn PDF document text
    • http://herve-coiffure.ci/files/99082100208.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e08e1c4c8546b9d8fb876c437ff5bb29/vizugikokiwapaxiloza.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/lkba0hvj7ekhbida1ua40nb755/vunufevodimajewivagelofe.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3ddd00ff01810242e62078e38c503597/25915341145.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/16823827723.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/12445321346.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/oxobikevidoradifeb.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/49750597550.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3884bf975---zitakanen.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f389368a7---rasola.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f7bedd94---14280438630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=complete+mathematics+for+jee+main+2019+pdfPDF 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_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 11508 bytes
SHA-256: 226ac1eeec035ef8b7c5da9bb1d38e0126d6dc9c1d376dafaae6ffdb1980fcdc
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 17092 bytes
SHA-256: 8034ac9b3b905151f5d727589d2af5f5d4a049aee18c434d943cb00124d7b58e
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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