Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d40c1727acdacda…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 09:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0bcfee4821937c09ba60445bde7318e8 SHA-1: 57e77fc71b09bcb7a0a8ea9c223fda2631c49f31 SHA-256: 2d40c1727acdacda78cd6feebe0c421e6a0a2eaa25caadd1960992503aab9830
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cm668j5tavn5fjmuvoa9ro2i70/24434091724.pdf In PDF document text
    • http://heyumpnd.com/userfiles/file///19149714157.pdfIn PDF document text
    • http://belst.by/upload/file/75940332787.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/wivepafebixubepewa.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/32611827132.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kigidazepojenekivota.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b8684f671daa91a55d89ed53f96fd0a1/zafexoxatapamiberarexow.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3844402398bf117906e135e424785800/32291292926.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kagedipevatomo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gvkon6dv92b4v9mb4d61ffdvvc/xatobejek.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608807516a787---tinurisenabigedevaj.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b604f3c66b---judowomikibadifo.pdfIn PDF document text
    • http://446888.top/userfiles/file/xafejozewogolixara.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/46131669870.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/xawaxegimom.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2cd9345f5f4eb8d9e84396aefae47f9a/96937957651.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a290398d74---riserolojibipasigusanor.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/kuworefibavivupalabulovu.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/tunobuzobugutofosovozo.pdfIn PDF document text
    • http://fotossc.pl/_files/file/levuwililubudilabuvanuda.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/71560026267.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/83fd8b58bf43af0440f0a5530a01a652/30957090176.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/35154531500.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/nipet.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/h210rr9pa83mk1l9ol13v7rge5/93866888464.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/numoxamademanibefat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=zebra+zt230+manual+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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10956 bytes
SHA-256: c2ade922569da44840642f01f95166a7290db4220871980a5a8cdc6a0c62e726
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 18732 bytes
SHA-256: 6582c2cf33a641d436adbb1e2f9adbe8dabd42aba99a82208dbb12d044391484
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1