Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3187ea708e6a89d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-14 19:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e18ce827ea78cb9061d439291d1d7d32 SHA-1: dd3fa66e761b480b6c265b67898374cb42a5a488 SHA-256: e3187ea708e6a89df5b668590f7e1ec556c54086d1b12820339f47eaec620cec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators strongly supports a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://inwebjor.ru/uplcv?utm_term=best+driving+games+for+android+2020 PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb6c9ac1a---55670069694.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ca2117afb07a28fbd71b2828f58651cb/zitiwurubife.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910230039.pdfIn PDF document text
    • http://imi.vc/upload/files/92931801423.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109121056085096.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/87851790921.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/50865849355.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/demebovujenosarebabifa.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tomugulerok.pdfIn PDF document text
    • http://juentai.com/userfiles/files/sipajevebuduruzugozepimo.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/rarifepotaxas.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/mifalusut.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/peluvadi.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210911165229.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/22340972138.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bd42bed4a470dd3fe6af4512d148e222/soref.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/34454618980.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/reparukuvulinegopaje.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/regiw.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/24069066107.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/81168989727.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/kunuluwi.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11012 bytes
SHA-256: 0ec1fa89cc379d8be053fe3593ddf0e9efa9b1bcdee845552900499ab090624e
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 17296 bytes
SHA-256: 3c76788959438bd7bfec948323eb653b706fa24327f5c979fe6f1761845fa162