Malicious PDF — malware analysis report

Static analysis result for SHA-256 54938b0c04d4ec0d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb1a498522ee6f26c7929582203e2135 SHA-1: db483ac9891b50f6aeedaccea255324b0d8a3920 SHA-256: 54938b0c04d4ec0d39333e6d208750c6d6bb157b0b79f14c9f61939926b25ef2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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 http://osteriadelcampanile.com/userfiles/files/masomubugudefojoluvukidi.pdf In PDF document text
    • https://cuatudongnhatrang.com/uploads/files/nedutetekejal.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vezogusijalupelikazos.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/37891340108.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/79439111613.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/tasajipumogi.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/28457079596.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xujizirizalemutib.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/42161340022.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348a93f3c7b---lerimivipogobozewe.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/59187474522.pdfIn PDF document text
    • http://anyimaker.com/upload/users/files/robirosako.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/niwodekiwewutujod.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/85156501506.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/xulopexox.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/625d23319ccbdcd8b89cdabfd00ace57/fudupufirazisavisorini.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/69058692575.pdfIn PDF document text
    • http://cissi.it/userfiles/files/dedofotadudinalibu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c05ec2226---83570135337.pdfIn PDF document text
    • https://shevian.com/images/file/zalezajolidif.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/92742873516.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78008024706.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/bumomunotuzasuger.pdfIn PDF document text
    • https://avela.md/userfiles/file/xikidojekubusanosipisefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+media+player+androidPDF 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_off0000c239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 10380 bytes
SHA-256: 22b8d07684ad97195dcde4a61dfc4f86dc53839d0cca662a86cbe3b2b21d73e8
font_01_sfnt_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16396 bytes
SHA-256: 9395f3bd77a8e30dc4f1390566a193d322bbd9f73bff163766e278b40b4b7d51
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1