Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fa5f13fe5c0a8c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 03:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f180e7eb3a6e52ac60782ed51a95f87 SHA-1: ccd6754e20cbc1c98708fbdd618e62839369966b SHA-256: e8fa5f13fe5c0a8c858201a3aa032cc64732e80f9a89d989ef013433c5c67815
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to further malicious content or phishing pages, aligning with a spearphishing attachment attack pattern. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdbfbc568---nemoribunobupezoju.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d742ea87---53690048651.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/lakodisaxubonudedafodije.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55976109903.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/40715853334.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/bazurufuwifilegotim.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be4ecd6c47492f62056fdbfe00611ed2/62987809441.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b8da2d966ffddf1a0e051ecdc932ee9b/zexukifavipad.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72c15440e---gigebajeboronapebad.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/aa062b28d7b1eb05c34049178e2d7acb/602580920.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/kegix.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfcde3d21a---12311926804.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873866b266a---mupisu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d4a81117---88980325665.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wezekotaxiguwog.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7ec177a8fc8d3cd4084e9324da49f025/3438484426.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16082222302b40---20788258650.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7f0b59cc6---13487277427.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/loduberuvu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/patufilu.pdfIn PDF document text
    • http://ligneus.hu/upload/file/depiwimofisudoredamoj.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f30f5442fcebbdae43e2970a19aca92a/66560960744.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887414e4f3c---54098336824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=accounting+for+power+purchase+agreementsPDF 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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 18772 bytes
SHA-256: d695b1382b29490297d23aa676e88a43e3c02e32d6beeedc44d5d476015902a4
font_02_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 11048 bytes
SHA-256: 32d3046af5a3a9fee9ee59d6513918d6edca8d8bb04981d84723271dfb8a9227

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