Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc5d0087d972f4…

MALICIOUS

PDF

76.9 KB Created: 2021-08-19 06:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f8ab5b4f85384623a91ade7cc9f6b43 SHA-1: 50e049c6b949ab30ece3d7f4a1225e000ebaa9bf SHA-256: 3cfc5d0087d972f4d5894c35e6e17bb19a8b8a47a0c4f2671db67bafd5f66741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e912cf27c7d---zesezejumebuse.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608916b435615---tidonow.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ohk6pode1713n966i51fse902h/47015397368.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/t6bj002j49e8r74me2ao6qte36/fowefijaranuxuxavodu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55225743e---48284356188.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/41871455406.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/64836186801.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/powupabu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7a60a71f---repixadi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c88479e0ccd66e12195d98603ea21eba/risuwikuxowemebader.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/94059030451.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/62106610044.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/daposokivudal.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/reguwozofotunerijowe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081934368f45---garizelirogedivedefud.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1dfb2e8726e3cea7c97b8b176630607b/51470150582.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161197c22ebeee---razilobejolofo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/44364079560e33f8036267.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94444589803.pdfIn PDF document text
    • https://adikkedua.com/contents//files/98653361749.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/52439694784.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/niretaxutevedoxuf.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90062101888.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161153643f0f21---34779027113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=libro+de+secundaria+primer+grado+geografia+2018+pdfPDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 16516 bytes
SHA-256: 02f564934eb4a3e44e576434cb2bc04d170abd71af6ecb1141101779eb82caa2
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 11520 bytes
SHA-256: c8b09b80e3d243584d4a3111cd69d5fbdf768b7284be2982a87a533e1469ee97

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