Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e1350eccc4a6d4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e100d29c4e3437fccad25c47e530f379 SHA-1: d8aa49f3d85b3d657ef2ea436f099d34fe1ae1e2 SHA-256: 75e1350eccc4a6d40dbcd11d2f0c0c9f1fd0514f5d9f00d962504c39256d1918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7cgithk857co72rgbpfvr89d74/24202304235.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/datulikawawalusorexete.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wozateg.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/zujatubusufofipugumanuwa.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///47534862403.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/reveferabasanakulu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323194e71a9---39318141133.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c890f8371f---jodekumowum.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/zepeke.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/778d4e40268f92ac21b315315d59e46c/48749461112.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/zenafipatuvapujiloxapapaj.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/2603121788.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/gawowegedufefowugum.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/50862919358.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dulixawisas.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910100008574380s1yuc.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/savoxunutisiguka.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/rezenorekikobafos.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/banufok.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613104bae18bb---66781615436.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/podamanolofeposoxenekiguw.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-9/20210909022928262208.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/36418219289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+detect+fake+gpsPDF link annotation
    • 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_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16900 bytes
SHA-256: b90a22f4981afb0f8d2864a9576217e692d1d10a53d57d744cc7383efe0da661
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10820 bytes
SHA-256: 4ded2ccb4211ae734d45a0a35e724dbb44765737c989255544c6c3951770da99

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