Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47b294fbf67d92d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 23:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cde1ea2d946ad0b41de84f807bc8f031 SHA-1: 303763d742040a45c2bcbcdc667d0c867f12ef30 SHA-256: c47b294fbf67d92db7f655079c4db91c220ff355df7b060873ff3af1f9eb20a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=how+to+free+up+my+phone+storage PDF link annotation
    • https://asiapharma.la/files/files/8170175986.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b68c59e2---89286990078.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/11801149173.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kunibajemono.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/44572673745.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/50077418075.pdfIn PDF document text
    • http://imoroz.by/upload/file/zusudikovulafavevej.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/32537856110.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54415075595.pdfIn PDF document text
    • http://metallpress.ru/files/56816776141.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/9763175286.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fitexowovopisutefubezo.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xotufobakenivuganitinutug.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/kopuregodik.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/lafazofatufivuve.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kipukewugurisul.pdfIn PDF document text
    • http://odumakus.com/uploads/files/24435058817.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/32962172076.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e68e3827f---8169842721.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rozufovamopowigosomo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459eac887---polipafedusozumujibo.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/wozufomowuvitobapizimag.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/razufaperomi.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/1838168915.pdfIn PDF document text
    • http://mosjob.ru/images/file/78803465154.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_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10960 bytes
SHA-256: ecd89ea2bcc67fec917eeb7b2d90a1928f0d4016438d40fc25b4a4dfb2390d80
font_02_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16828 bytes
SHA-256: 303c1ed73f83534082cfd857f23acc15904572acbdf4b79bb098b867560729df