Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3512037771dd8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 05:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93fa5be13abd0449ee12de672d87b0b3 SHA-1: 2e52a8be3057db033e4f553fb9e8a784c7ec1365 SHA-256: 25e3512037771dd8ea20d84987b33a561f2747fa2ff5d66c6539ce201b834915
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://printsolutions.ro/uploads/wysiwyg/files/netafulofezepaligupemul.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/rakajedenavan.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137681412a71---wogiw.pdfIn PDF document text
    • http://boldogelet.hu/media/31173097890.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/18185593.pdfIn PDF document text
    • http://minhanh.com/files/91172953690.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sivitelirafumi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/58366606529.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/jiwupuduravexuwike.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/vofejojodiraxexowag.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/86648824430.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370033042bb---puxipi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/fidokososetonomeziw.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zidojoxevegulukixojozuke.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/bojopubelor.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/13925980726.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/86867524033.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/51736056421.pdfIn PDF document text
    • http://husplaza.hu/editor_up/19634238267.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/57546825948.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4b097beb---peselol.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/36941874885.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ralizizusid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+city+ideas+listPDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 17712 bytes
SHA-256: e7218edd5580cefa9b1db52e16fb75aadf196fef8569a5f3fdf89896dd53dda6
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 10456 bytes
SHA-256: 357922adc255db4727e72a48649290770baf95123507e0a01fb2f4ca1af10b6f
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1