Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45bf5d88fcbfb1b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 11:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6efc5e129a42fccd77cc68d68dcde6ef SHA-1: 023b5f0cb552ddd87cccaffe991a1cb70facde0a SHA-256: f45bf5d88fcbfb1bbb53108801d666f5f658a531f7374c55d75ef4e9f17a1757
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body was unreadable, but the heuristics point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=preeti+font+download+for+android PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381608e34e2---12973378134.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89141671929.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/liwanegomexitumenitolijo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/57027356975.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/faminatilug.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/sagezizuvopepusenoz.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/45814732257.pdfIn PDF document text
    • http://webursitet.org/Files/file/94521408896.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/2942223469.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038add4805---32061502919.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kudarolowozudapazafabedul.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/21184977381.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fbb76e3---60391616343.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/sizalakivow.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c91d918ab---fumuw.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/10168192182.pdfIn PDF document text
    • http://adice-area.com/pictures/files/42840109643.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/wigutimevizizefunowuzumo.pdfIn PDF document text
    • https://robertbah.si/files/file/78505806235.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/5742451241.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86121032---3794139905.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/togisilopaxotizosomewi.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/galejadarek.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/85443155643.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/40570347989.pdfIn PDF document text
    • http://hejia-ele.net/upload/batelut.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16364 bytes
SHA-256: 25dff09589c89006f136ede095571a397b314755801dc2d9adf97a40ec1b2af0
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10268 bytes
SHA-256: 6ef69e6ad1af0090a06b2a3394f95d91b876e10dde4978e815a2fddfabd23794
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1