Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6dfbe16f7437e9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a7fee54803008bec5aededb12f9b560 SHA-1: 6bf8e92f1b91cb15b627f05f3e0b75a72541426a SHA-256: ce6dfbe16f7437e976a633601549fd7e12ff39f1e5f4aa35201dc0652ba32ae3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=kinemaster+download+for+computer PDF link annotation
    • http://kunbot.com/upload/files/82132602076.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/799719b02de0b62b30288c3ee076bead/73716921477.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d97475d0---15511839566.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///kipozunomekuxejaremuver.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b57a43824495814f5bc0d12074301bb3/pinafufemafaveduk.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16127801271aa2---surafivadun.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fd98512f---talakixuwidawis.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/1350281960.pdfIn PDF document text
    • https://suksesunited.com/contents//files/17770611532.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/95385364282.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c2e4ddb296ab6622edda5af74b38dc37/dureg.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/93f5bb7c4b56c2269f1631540baefe4b/65820238511.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/uhfj0guvjj6aru9nscpkg03053/wedarasusafegowifafipamiz.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/radusizanikalifexeril.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/gasudowuxefuveviziregaluw.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/bosunazala.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160872b511d08e---zipubakunemerivupez.pdfIn PDF document text
    • http://jarosi.hu/files/file/barupamavipagawa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/501bec229100e21bf708f08552fadb77/69063755773.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/20782383354.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fobij.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/tisebokumakap.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/82711710351.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/xabewizoluminolabalur.pdfIn PDF document text
    • https://digireg.sk/upload/23397835082.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 10956 bytes
SHA-256: 3f8a1be2ce6795b300a12218c05f8c7ca99c17165b4e270b0a13e5d867b4ffa3
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 17172 bytes
SHA-256: f8892d28c99f6134f3dc485b99df7811266e4e021f1b96f2d3ccdc8d093b8568
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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