Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61b97a1580e7d70…

MALICIOUS

PDF

79.5 KB Created: 2021-08-31 10:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f81ea7cfd0ebdd1dc2bb12f3d1291924 SHA-1: 0ad7ff951574dce3a99f3c1e564dbb4105d2920d SHA-256: c61b97a1580e7d70959fcdb828e223b19e70e28b7e2e014a4a3b777c3715a2a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

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://cructi.ru/uplcv?utm_term=forest+and+wildlife+are+renewable+or+nonrenewable PDF link annotation
    • http://playbabydoll.com/userfiles/file/8484793771.pdfIn PDF document text
    • http://nktrading.qa/file/files/27138800346.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608742a0450f1---kivaxaw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/04769f26c877b009a379f882dc1c4505/gotepokufozup.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3c5c56693b7086d28ad3b964b607e881/kudenelexukubowopofogez.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/48838805160.pdfIn PDF document text
    • http://prmakeup.com/Image/files/talinasoxekuxinuwuganeton.pdfIn PDF document text
    • https://pellevah.com/upload/files/dowusogopi.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/jupepanosatagajijeg.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706efd16eed---38911770302.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d285e01acee716dc0d8321e062eab202/bixagakedoratog.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1ba509893dff928157ff8fdb36e0a119/wuxogopejatodidegapoke.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1a85cebb6af62850388b83aed699f17a/93323048112.pdfIn PDF document text
    • https://spacio.hk/attachment/file/67260421809.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/miziromuxiwi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e627bdc5---jotazofuzufuxini.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210818032407.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/giludazivubugatunetimal.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hftd09qpous88q0nc09eo6sjs3/97532897281.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/73717160225.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a990693fbe9---ledazuwofatibiborowu.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/31218057339.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/rewelodepabaj.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bb2023b0be85ad32cb56c7a3390db5f8/dopevisag.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/2009565969.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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10552 bytes
SHA-256: 2202988d2efe7449c27eda80eae90a8b5c0382d1075565cc06fbca34faafbfd4
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16948 bytes
SHA-256: 93a30ea010bea5b50a8fa2432157d4f1f34fa6cfef15588662730952d1f76ab5
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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