Malicious PDF — malware analysis report

Static analysis result for SHA-256 50718dedcbc113d6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 17:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be257772b74dab71aa2ccf78c6dab9ee SHA-1: e6464734d7e0da2325d2728d6078099e2f475713 SHA-256: 50718dedcbc113d62a8345c8271b9d6f30db25e921504957e15f40607a42a58e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=convert+xsl+to+pdf PDF link annotation
    • http://kiszelyugyvediiroda.hu/docs/file/rogepulofadaxiwegedim.pdfIn PDF document text
    • http://wsm.hk/images/files/21013917746.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bizofozisuvatepevoxola.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/22979748057.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/88982096012.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3104f069---12424405566.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jabeta.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/53324939070.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/bexulovafedal.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/5174446835.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/36917573024.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38b41dd59---pidusemilufuruka.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/30873329935.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/nevelaradisa.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/31993571234.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526a5e6ab---zitepisabobudezige.pdfIn PDF document text
    • https://yasacompany.com/upload/files/raxowabuxuwasapiwiv.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/38495452136.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_115010.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/mefefafifesu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qap0tg5skcv7h42306kgdk50o4/tizimabun.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/83816030805.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/4923995331.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/wobutezajuzariveginani.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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 18264 bytes
SHA-256: ec2d1fe4eabae840bad0c1ceee0f6f0533f62cb8b4ac03c94b912ecd939eea43
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10436 bytes
SHA-256: 17ab8985b1d20cb01d46f659ccf60c0148161c8f57e697a59f552d9846183a18