Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2c055fef9451f1…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 18:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca5093105dc9e39e4990c4fe0df042ae SHA-1: 070a22d5da92721382c393fb26c926f4d7f79828 SHA-256: 9c2c055fef9451f1b1787806a600b37d0c0c8a1bda7d2df7a2aed7b4992835ec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crysiq.ru/uplcv?utm_term=vaillant+boiler+ecotec+pro+24+manual PDF link annotation
    • http://goddesshair.net/upload/users/files/vigubuloze.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfbbabeaeb---99207726913.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/14469298534.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/dabebaw.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/28280819654.pdfIn PDF document text
    • https://maria-galland.ru/files/file/kinogutawenad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f35834b0678799d3c44b0e2137f340c6/16809082243.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459072a685---53395872482.pdfIn PDF document text
    • https://mbbs.hr/files/92432150595.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/22607494661.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6710683e---78991947201.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42f688aa381cda42f4594dcd2a7afb88/pibagi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca17dd0bc6---lulilunopor.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ujjt8thka3cp0qoiegmdk8pr63/gavulisupewilevirexidor.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2f6884709---14076070061.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/95213340625.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jadakanisezi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/772dfe644f2a5aa886b5e34e8ac38bf3/gozamavidato.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b5321dd2ab9c1fde742badef2bc18a92/nuzapapenikiwomewufam.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/38498290610.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0717492ce---61727077218.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4slkn7aduge4bdnomqgc2c7ovd/vavidurazupuwodoxofov.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xuwovesetatogojor.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c4797bb2---mufuvewotubisubixo.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/76393464353.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_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 10776 bytes
SHA-256: 937a307203cb3d20f0671c9b3a6ac4fb6b2d1096a7d71dc0827255f26af4e170
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 19076 bytes
SHA-256: f48a4fa77f697a0b2862c793e653ea9d8acd9226fae24ea31312309b638766e6

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