Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca809291fa20271…

MALICIOUS

PDF

93.2 KB Created: 2021-08-09 10:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba41a2fedfbba3574a92e3e6e12a1879 SHA-1: 02f872c9c76a2b004f3a22eaafc9552db6472560 SHA-256: 6ca809291fa202710471e8ca811f7156947c045780483a35a175e830ae86e99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://nomylo.ru/uplcv?utm_term=java+complete+reference+book+ppt PDF link annotation
    • http://staropolski.net/Upload/file/52442277073.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b05c3549f15f8845fb2a0eb1d1d542c3/dalolobu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/gimorapelupipugotebosu.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/61120953277.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd066497e---92278042352.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf276c623---malivawizumukefuwewow.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/91020800651.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56550590e0---dawuwasutezakixegimutawu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/28ce4311c103a70c77493db25f3caf0c/siwoxeborifosatikoweduf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f027043e10d---90588915394.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f531b18496464d57e300c201666fad6b/34720129225.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cd141697fd74f26e6541d8e2e3895eb8/92524742403.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0fdbc799d692995e99f57e058fbc6a11/84230758661.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610354465676c---majumobuv.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ab8fe7341e1d2b79201ddcbfb9675fdf/zeninudafoko.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/sonuvamafirimobepolasob.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/936eadf710eb22e791c9a7b615768b17/xovududekamenogopod.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625436355dosirinemexidosat.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f90224ca02b---benewugivoririwunarenuzan.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608839b79ded9---24731199473.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/tipesosizibesikewad.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bedbac104---554627024.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekefufinus.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/turazenewazikuzide.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/u67h5ovoqdajqi3idk2qc3cj3a/2766229978.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b8jig83pkqgunqmds1ak2nn2i8/lozajemadokitodedafimirux.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_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 17068 bytes
SHA-256: 3c764c0222b34182c4b86078f3f2dd739256ec66ea2ddd269b3872b3848348fd
font_01_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 10668 bytes
SHA-256: fce6d85d514b850a9646291a5cc4bf714d0b716e8a0861c9c804173aafe27f7a
font_02_sfnt_off00014e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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