Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea181edbc9985daf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 20:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16e7be48678b323dcc3870eea9380627 SHA-1: 9b16cfdff77338b633e6deffdc910f4e46e98b7d SHA-256: ea181edbc9985daff4a3154712d5472b71afb869cac499df89146cfdfa96ca6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure the final malicious destination. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a false sense of urgency to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://iwort.de/userfiles/file/nesuguf.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/kesugurifurifati.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/35642690868.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wamijeluwikejidutozed.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/romujizonukaxekevafibe.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133016da7990---40556866493.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/xopalixutazukuwozu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9fe25a2---vevaregusedoz.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355a2a6f2d---99600540898.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/wudoborunuw.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/49717236097.pdfIn PDF document text
    • http://kvrhousing.com/uploads/19604179264.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929ed9d96b---padisabak.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xitugomu.pdfIn PDF document text
    • https://le27.fr/docs/file/41866992063.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/63945214591.pdfIn PDF document text
    • http://e-sportis.com/images/upload/34990300260.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/93106394777.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/niwujetagakabopuj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/566c629f3dd5dfb20afdd702111daccc/99972376907.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/jupojemekubuvat.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137249020a01---pabovuki.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/83193269031.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/807vrq1vpad5d7f6o05660saf6/33463941268.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/54320449996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spd+fastboot+toolPDF link annotation
    • 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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 10280 bytes
SHA-256: 6e63f8f3c9042b946dd8c4e0e1b9ad093838c70a5c0056343eea36e1c468eeb9
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17184 bytes
SHA-256: 6b0e7eceaec5df82f5bf1aac1bf627a4cd10438fc8ec4780bc7e7e504cf0e479
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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