Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c767e605d8b3d0f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca4c71aa3a894c33fbc1fc1e85c2e49d SHA-1: f41dd49240a5c54c5efe5ddfe872de3b39065a5b SHA-256: 3c767e605d8b3d0feb3a862dee413e238e842bc5f82b7355289ebaf0917cf7eb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sunnyten.net/userData/board/file/notibapapapidumuxijato.pdf In PDF document text
    • https://onthespothousing.com/userfiles/file/xisodapi.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/74035914548.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa81aeb1a7---85605433677.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/37296965813.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f560c1401---81840511244.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/6000057605.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/likazutore.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/zimikusuxi.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/34755358668.pdfIn PDF document text
    • http://capital96.com/userfiles/file/98259156558.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/41407284863.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136706918fef---84521740791.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/gevatu.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/wimewevomezenowaruni.pdfIn PDF document text
    • https://sainaudit.mn/File/nolazen.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/zobarosofodibovom.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/dipisotuvizikowelel.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/66247044321.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/44442520349.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/madovareliwi.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/64676926805.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/88132018276.pdfIn PDF document text
    • http://th-hl.com///upload/files/61983150482.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/bizolav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=interesting+facts+about+shakespeare%27s+playsPDF 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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 11192 bytes
SHA-256: 022e8b99b00fe90a4bb880272aee7352c6948d5084a55001e7ea01810ab96a6d
font_01_sfnt_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 15260 bytes
SHA-256: 1eadc88ae7e8d00d2ebbb3a7bd89bf7d3e0225cb02f3c88202a90ae00af29eed

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