Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5ad7ec9dd46691…

MALICIOUS

PDF

87.2 KB Created: 2021-10-22 14:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7290c06c7cf3094c4c984092ed50dfe2 SHA-1: 9393f5a230684975ea5101c5d0d427c95a4f9914 SHA-256: ce5ad7ec9dd466914046d0fda3b3470966d3a5660bd3fd13628605f2598ff569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to unknown or potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nullemont.fr/nullemont/ckfinder/userfiles/files/89288139096.pdf In PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/43514784754.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/88735012022.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwolamiguzi.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/79331214500.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/37487018332.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/82630376576.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c5c8481bfed957afb5ec6a6c7a7351f/lijugazolejexes.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/10557151202.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jaladijulobupob.pdfIn PDF document text
    • http://www.2m-france.com/img/uploaded/file/96851034018.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/2000148420.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d3784d9f---luwalaw.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e8957c69613400e8df6d1374d358e899/lekabelesatid.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/10163012266.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/jukuxebe.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/12755668861.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210929115321_1435397124.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/miloperujumi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89070043134.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/5246335530.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=wow+best+mage+racePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/mafibife.pdfIn PDF document text
    • 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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10552 bytes
SHA-256: 70c8cd83e2e04c9d4281f8ba75265c800bb9538fef6d4489936a1935e227264a
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 18012 bytes
SHA-256: 5567d708cd14108eacb144040268a257d87602ac9c3ae1f7555de2178124507b
font_02_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1