Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1d6c2c86470938…

MALICIOUS

PDF

72.9 KB Created: 2021-09-30 15:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb77f305b1b1f02a6b9894b643dee4fe SHA-1: cb7a970d11a145941da5855bfd6f666c05fb55bc SHA-256: ec1d6c2c864709383c4a02f54a032a486f3acc055213c52f510aafcf75d20af3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=camera+icon+disappeared+android PDF link annotation
    • https://lnpro.in/ckfinder/userfiles/files/76005001599.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46880441425.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/82280122518.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/dagefeduxagebokaxejudofo.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/tafujotemibijivirekaja.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/wubasederesapaki.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/7176134703.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/98045786045.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/520651b3c2231f82e57bfff7c2d21a03/gokirejemogo.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/vuvixeregutivodifo.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tibud.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/geribetegelisogozobaj.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/45704339432.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/visumoxiwaneguvola.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/14668424115.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/tidajamomejunotupisegizos.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/41477273898.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f60cc448a1e4177ad136a1947c8b7d2/96940710357.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ed4711944---bitufogerefixijudawefad.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d062df2c0---83100447193.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/mutiv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ce593e1---dineverub.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd64bd0b---61222049009.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/nolofujewofadozonaw.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/vaneruzozejajomen.pdfIn PDF document text
    • http://immopolignano.lu/images/80469955721.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_off0000b7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 17980 bytes
SHA-256: 4c648050c20922f63d266cf48499e81e58789245736a47e0d0c707b51068c12a
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10564 bytes
SHA-256: 9e8f30108daec7104a7c8d62a22e5ae36fe10bf36644fb1c464ae8d64f7aaece