Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e245745419fbdc0…

MALICIOUS

PDF

99.8 KB Created: 2021-09-20 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c45392c769d3d9faeb0874f9d0734910 SHA-1: bdf59d0a9a632cbeaa5cc0baf4337e3407927990 SHA-256: 2e245745419fbdc0d3506eeaf0439627b50f33e133763ae8732dbfbee63f4ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the true destination. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ntc-container.com/upload/files/kimizilodegiz.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/18591903460.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/7135372032.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8b900400---gogukejupifavutu.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/tozirepuse.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/91937847455.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/rejotun.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/pozosovasowozuguterutaz.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dee75837---94323672506.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jetosedununuduwovi.pdfIn PDF document text
    • https://maymac.info/userfiles/file/wiluxe.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/53116305500.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nuwaber.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/wazuvipu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/4516143049.pdfIn PDF document text
    • http://wwsm-us.com/files/file/50421552808.pdfIn PDF document text
    • http://airsoft1.ro/files/file/38892311604.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/54628976903.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/46712486743.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/7910211249.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3m23r03k77kp7f7uuf0q39bq73/fatiwapipagufavowo.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/lumofunemabudavoku.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb27c348bb---77417821027.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161405f3f3f2b8---budafatuwetujeru.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422c20d6257---6447902198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=react+native+duplicate+resourcesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 10716 bytes
SHA-256: bdadb4ceb785b10a132f7a3fd00b6570e9232ee3afc98614fff0ed5bd20c92ee
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 21468 bytes
SHA-256: 456ce671335a81a7790931e93cc81d03ec21c54ff0133558f1eb7797cec6e191
font_03_sfnt_off00017855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17855 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1