Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6466a2082ee6491…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 339d4a62966a9928bbc7f0c72fe660ff SHA-1: d7cac993a555fbc8fc8a5b67e7054d8b301d3784 SHA-256: c6466a2082ee64919e2c762015aef425f7c00e96985e5aa75217cd14b466cf7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The presence of multiple external URIs and link farms further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://doellefjelde-mussemarked.dk/images/newsmail/file/53863365900.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e835e249c6---nowaruxunepezetabazovi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/d3rufji69au9hu6pdc8fmf3auf/5032944829.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/48564760802.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vulidagaguneda.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/4112325492.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kuxawarodoluki.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nruq3lo6rl1miejh6btueu5mc4/xabuxuroxi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea073885ef---bokidugozadupate.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nilafawitafi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096abae2296d---26109083571.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/32445202650.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7ip238odjfn31ugoep9o2sjka1/13570208503.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zegobazepujewowejitajaw.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g8pafereqr1cob5jrvk8hf46tq/10564415284.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/42331696850.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/473mq1mva6lpdf5u14k3cpv6b5/pafafebutakewevimaki.pdfIn PDF document text
    • https://vestol.bg/files/file/nalovajarewaxopifusese.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/632461a7ae9f9c92b8490c1f728a3671/96128861156.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/panafupasimimonajetap.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ac2583iomg03mc2qi38t5ncgv7/sowib.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kaxapifukibibefona.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e703e0f61---89170630276.pdfIn PDF document text
    • http://plncse.hu/php_data/file/sagomeravuporuxuziwawujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=clubfoot+in+toddlersPDF 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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 16428 bytes
SHA-256: 39bb0bacc5489a54f4b1a7e02b1f4b4793ca78060224614ae528a98c7f69e8b6
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 10456 bytes
SHA-256: 029552c6e507dda14191c8ae913fa96d442176b0da0d0472088cbc9a47acd63c