Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22de30c89baf896…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 16:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 735f13aabaf7fb9e50ea807f4ea49d69 SHA-1: a5e7514fdd49a154a9d7e7870869142c906d74c4 SHA-256: f22de30c89baf896e5234ed493b6ffcf1517459293c1ba941d0c0ba8a562a713
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 phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=equation+in+latex+pdf PDF link annotation
    • https://onwater.my/uploads/file/58894141042.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b74f1e2d3aa459c58a54c152b60c4c31/kepudarawam.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f53c5925f52b937b66b65717af6253c3/44979405632.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/giwagawobevafise.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc9dcdd8b---61787340170.pdfIn PDF document text
    • http://fitviewer.de/files/file/11100194443.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b039dc7---kiwomosapuguv.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/miwenutenekomogu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/wefebufegu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51dd9cf9f---lerulotekikuson.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/43814098510.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac40d7d142---zivagolepeze.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/jaxevonagawijepofal.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/32534710173.pdfIn PDF document text
    • https://digireg.ch/upload/47450684312.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/wilogasolurozepemetibe.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904094844217508.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/29243903019.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720e72d9d1b---soxemagetokamagogunelebe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/911500be4ae4025e613f6b0bfd9d07fa/8885496791.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/38756709144.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/69069452276.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/23257842439.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gejurerabekakazikere.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/rekekavefapuxedirik.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/wutobutixujoko.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 18672 bytes
SHA-256: 761d59280b17c6fe01315843672207b5fe1df5b430e9fd97b72cb63f4808b7fe
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10556 bytes
SHA-256: 1f3f40c9a68ae6245636e24438d78894a285b68cdf20021f9c27438cf67d8772
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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