Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddc81a6b4b0d792…

MALICIOUS

PDF

85.6 KB Created: 2021-07-27 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61105d73f904d9b73693e181f241f1a9 SHA-1: 64e3cf588d29103b64819b96440bfe0fee2f2f83 SHA-256: 9ddc81a6b4b0d79273f799a0642e27753febb4e505d4e02c99021445213a309d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://fontanarosaserigrafia.it/userfiles/file/sosifubalokagi.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3613b9cc---68328040524.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/33472991856.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kepiroxa.pdfIn PDF document text
    • http://funperm.ru/content/file/peninumumefitalab.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d8c48462f---jekug.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607981ef73bfe---misefogaru.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/suburikekoxoduvazik.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/nusaxamomonitukap.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ee73449---pekuxetoxukudidogijunaduf.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/89915777652.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/disasopuwebare.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d73ca1f4---wudifavakanokez.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/sofato.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/petupisunalurafas.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/61e8f7e4f7f6f5a8bd2595b8ad685e3c/32010913074.pdfIn PDF document text
    • https://iword.de/userfiles/file/26795946294.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/45778010163.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cb5a76a67adbac087d8dcf1243584454/71811658751.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/038f3c55374a3c3dfee508f75848bcd8/92872959030.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8a9234c61---widivunaziril.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081041c2b338---43646586148.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd1736206---94885824960.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160923b255604e---84398919954.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sukutebutawezewisibuvezuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=titanic+partitura+flauta+dulce+con+notasPDF 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 17552 bytes
SHA-256: 337868e5b04d875ee8f67a3c806bd319b04ea972afb4d00727d0c86a85367a14
font_01_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10676 bytes
SHA-256: ce5c2916199ed51d08653fbf4e7df14b7ca945ef568d8acd00682933b3bc2d2e