Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e8a5bff274e3ff…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 13:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adb1a67ffb3a121fd96a9f148ffc6666 SHA-1: f48eb5f64f19e8f3fbacac12d47c509b76c574d0 SHA-256: 55e8a5bff274e3ffa12c6f191be52baa9472f92c41c703e375475994a2177ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing to the use of compromised web infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c80db9e0---duvomowik.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/66250811045.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/npsnrfg8tm7nk1hm3l0nolublh/16439190540.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/76647914976.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/bedosixuv.pdfIn PDF document text
    • http://underbutter.cz/download/foto/jotixanolupiwu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ad650ede76fpobr0re9ufelmfq/19075421527.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee46949253c---159912134.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1b7812f5969321ffb2ef63ef3fd39c28/87514895657.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/vimiximuwoledusumuki.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/66454507021.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/lebilaboruritaropev.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ed8q36nupqbqlh1kca1cvit4r1/ligipobuzig.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/95057819075.pdfIn PDF document text
    • http://consade.com/userfiles/file/99102023501.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/nipafibewujanus.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/fotufotitunulunagegalira.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/i8p9a81pkb16qco3ss76vekvs1/zedufimoj.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/fawiruziw.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/15849310480.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/27cd626f6490c58090132b721f7a0ed5/fivasenemivuxukasagiri.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/kotutanupuvuwolidawadope.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa554e1e93f---7372768449.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/48424841846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rtf+to+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/27c62828335ce77d86a64f77e3cb7c97/boxetupuxepuxivotabika.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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 17480 bytes
SHA-256: cd9e0bc56c3163b9547e6fd3bc35c24d08c77f6644a6d6ad2e72bd1554051e53
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 9732 bytes
SHA-256: c426388fabe1b09c3b9c405a0c13fa4272b849b418cfe8b91fa34609b587ea4a

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