Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24d1e5e0dbbf29d…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 12:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 555226f6a56d975a84f1085657299175 SHA-1: 8930dc6572829bc12236e67523dfd540cf2c169b SHA-256: c24d1e5e0dbbf29daf3bab209eb0e01b69bd43727edcea5df7ef84ccb677889f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/92088519162.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/97013074721.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/wugogonudemodu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/98d917d8a13c22d660669b2d360d675d/59522162966.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/niguj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161561da6417e9---63196665944.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090202565373499.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/lefobidojewejo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/47629368807.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/6874255279.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/66832289229.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///7239008073.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/12055313164.pdfIn PDF document text
    • http://kelvista.lt/images/files/77940883188.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/64542237134.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615179db56bed---boxisafozexawadenolafubar.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/1290366843.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb8a1df15---78504638053.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/daxit.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/vafumosediwedibo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/90063021647.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/3693245272.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/45346759409.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/devutilatomapazijerev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pes+2010+psp+isoPDF 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_off0000aece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 14872 bytes
SHA-256: 2533f17e9024cbc89793ed0e98754353e6f91dc29c1defcc1d94c813a33fc97a
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 10028 bytes
SHA-256: c4b83aa40a25e8ac8cc9e2dd8512b158bfbeb16c8b86ae6b20e163f4e94fb6aa