Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de8230b0e048d4d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 04:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64ef2826a8146adf8ace45e2132de33a SHA-1: f8d290c1655bf337357ab7d8f4b03494cd946229 SHA-256: 3de8230b0e048d4de471da4da673cb96c74f2375b17f1e71fe55dea71bb0d160
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. The heuristic firings indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=3d+waterfall+live+wallpaper+free+download+for+pc PDF link annotation
    • http://interroadholland.nl/userfiles/file/pewokakin.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/54b4902f514fc43a1c9adc4a21a15b87/46850132851.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6378f31a---92469560917.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/69627985180.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/59275710419.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106c034247---pubikorususenanexus.pdfIn PDF document text
    • https://buyafranchise.org/files/files/76328153087.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pemimivobosaf.pdfIn PDF document text
    • http://otczenacts.com/media/files/80666344223.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/josapakefobu.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/pokig.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/32007406494.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/minof.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/15786725886.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fc7480d2.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909165309228308.pdfIn PDF document text
    • https://tivicom.vn/upload/files/xedulixugudatibetup.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/25536247706.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/65061437671.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/fepimopelij.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/jixujenaduda.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/31958593393.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/midujiraz.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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 10672 bytes
SHA-256: 8f73bed71c4d74db35fcecae6dfa201677018960d334dfe8861775955252fe20
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 18404 bytes
SHA-256: 16948a2187838964d3332913731b5af5b0488ee6145fd45b3a43cfe410f2e515