Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc5238a4d90f40d…

MALICIOUS

PDF

83.2 KB Created: 2021-08-29 07:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b87fd2878135d6a09d5751388c35e0bd SHA-1: 742145d049729d3ab413e45b75bcec526e26c4ae SHA-256: ecc5238a4d90f40da9690e1bc2c147f6b67d086681156682ac7437773432699d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users away from the document to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=you+are+lying+in+tswana PDF link annotation
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/voluroligivevu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2802c59b05c285c8297ed2c4b7eed670/liladubowivevopa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dnqdjlgs6mgapvgheudb6n7ml3/80270330073.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/48258961057.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210707_183722.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vawuleduxuvu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753c0e7e19d---nemox.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nelevivok.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/88040688725.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/newagodedovag.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/mazaxuwosuzulanexomorabeg.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611787c966116---87114837007.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/56851592806.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/38eded6ab216c90c30b5e13bdd709e07/lopenabetukejebuzoratume.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609466af741c3---73179941332.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/67ee4e406caf12735f0d87524dbcf9b2/12710842138.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/3866320317.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061519541614.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k40c5e8il9s5da8jgq0ejuebl4/ximovefoxutoxegos.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9a5210f---89968954543.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9827aa0873---pekesexomakopemir.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2iiu022qln57kg80fjbjavd2rc/tuxasujenozowatuzet.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zulipamelofakedut.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vulafaxusoxaru.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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 17724 bytes
SHA-256: cd6180c77a940ab120cad77e7e69a8382bf6dca5083746722100456983def8e3
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 10568 bytes
SHA-256: 87abbcd0fc497e6df7bd034dfd9ac6168b91c7f860562ee7fef7299ce153fe9e

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