Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e835809c137d3c2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 23:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b07aa27230843f67471fea846a9eeba SHA-1: 53cc23ac3d67732a87d8134ef43985311a3efd25 SHA-256: 6e835809c137d3c232ea06d87701cc27a534bac36c15331c8f9a55221a616e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59e567fe70f8a357a1363f4ab55e8ee5/7311669442.pdf In PDF document text
    • https://xanbiente.de/userfiles/file/lepona.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/74329006431.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dc581d059---gexobixudetifajolalabomim.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/bedufobami.pdfIn PDF document text
    • http://praguetransfer.com/files/file/46851625396.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083b24bb6813---gasino.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a887ecc741---58624879745.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/zomuvovixapiw.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/31812015494.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1ddaf02f---15417741293.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8784602481.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215201748389291.pdfIn PDF document text
    • http://yuha.be/_files/file/5816149342.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/41dc47edc7333b72de43d31a8c1c6ac4/xuzipumezewejuvusi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c3675a7d707---47630362713.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3db093f104af97bffeb14e200d597329/sezimagegezu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4dbrq276blt9a13o5eur9qn2mg/genexetifaki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f981bceee---popaso.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb10d981f5---84962731336.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/83152992989.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/14ec7691bce6f9a510c0cd4fbd09f1fb/xulesakilopajujipulawezo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ced673f2f437478126a286afb99592cf/64569761346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=making+friends+brownie+badge+requirementsPDF 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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 17276 bytes
SHA-256: 2d60eb8daa2aa38a2561319f46dbdc6cde3c710f23cbdeacbd6436f5cb05fa12
font_02_sfnt_off000135a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 11208 bytes
SHA-256: 7c45e9c2efe969ddb033e56a848cef1f4943971b77d89ce8d223904e7576bdff

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