Malicious PDF — malware analysis report

Static analysis result for SHA-256 c251c1a02a29df92…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 05:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34092e634cb97dd35b3902080c4a57a9 SHA-1: 1d1f22e22aacfb4f60389fa3b73435a6bf5b3c2b SHA-256: c251c1a02a29df920f4b77cc0e698b7880da682ff60e3618b3a354ec6d7679c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=flame+test+lab+worksheet PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/45514caa3ec3b54fa1f40faedd607ffb/turajunuvidopujifeden.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/gosomipoketekuvor.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ef30a71---18511846177.pdfIn PDF document text
    • https://megashina24.ru/files/files/33065355332.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/mibikiviwapoxekamu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87009180e---10828736217.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/dibiwogazidadunipar.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5dd47d1d4192ee7cd8ce81dbb598466/vevovebewepo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1586e219d36ec1cae876f11faaad8014/gediradudunetirede.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609469ec92ff5---84924829367.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd134ae2331---lategefilerikoxorom.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kimemufurizoluxisexujux.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/4922602193.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/49853943353.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63634543a6---guval.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c54d65a44eac8a8fd86baf817b2ce898/valofazimejajebixazapaja.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/35121938809.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b958696afe---regapasedi.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/gubuzisesulukegati.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/poxalusotate.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/wovafiri.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2404b877---gokuwavoguxovujez.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/losufoku.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed743bd00e---50560680457.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/jejawezuzifego.pdfIn PDF document text
    • 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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 17040 bytes
SHA-256: 7579de7513838e2d3c44b8fad60b0a0ef7d64943acb2e4584b244c0736eb55f6
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10472 bytes
SHA-256: cc6caa1293b1f344cae0043df73122aa95511d0ba9b20275fa630739d962d310
font_02_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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