Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69f17287e86d6e9…

MALICIOUS

PDF

115.9 KB Created: 2021-06-27 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802a97988919dd3b3efe5ffb845d14dd SHA-1: 33fd6516d048119ebd6ff346eedcafd54ca13ae6 SHA-256: b69f17287e86d6e987ee0c34733eeac6837657d2d89f9d9d079023f68d25eac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=best+supporting+actor+nominees
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d04c488080f---nalitapuvofetes.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29043b0af5---6557301177.pdf
    • https://szekszardportal.hu/userfiles/file/45827141281.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/36efc7a8b1b330da6c98f0a24f9aba1a/56546187581.pdf
    • http://aarogyamedico.com/userfiles/file/wizeriba.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/83265416332.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/wewine.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc770e089---67209887105.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/27c24577d4529bce5f6af7282ecaa4ce/65516046098.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608703c254039---94120507035.pdf
    • https://2acontractor.it/images/file/mibajetoxenuperawozasiz.pdf
    • https://mauspro.net/upload/files/vifinukagobejefupinako.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1d811ed2---fujugesub.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vemr418ckk68v87btphq89f296/xiginizofoxelojituxit.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ng6bsue065tjabr596k7i7o41f/sesajasulokixipe.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607329632a30f---xedomexigobidapo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9adce3e807---gizuvoxenufinarelumizo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3ph4nmp972b7e5e236aibatc3/bugadibitepibulezijiniwo.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/44880566287.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607936c4ddb08---bikideputunigererenubu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016017.bin
8fd5df57d5a0c5a68dbeb7b4a60c959c4d037f24c904fb58b089a31562a55e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x16017 18488 bytes
font_01_sfnt_off0001900b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1900B 16792 bytes
font_02_sfnt_off0001a822.bin
9e159b161a62f91fcf0cca25cf1cd3e314229dd8694d360c4f5f36aae31de483
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A822 10824 bytes