Malicious PDF — malware analysis report

Static analysis result for SHA-256 8468a09b0ee1518f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21908c2729e6a8bc3baa3f220da7a15e SHA-1: 2b49f4c5518893e75a3136c24177bedb32bd003a SHA-256: 8468a09b0ee1518f716bdb52fbf07879d3cd9fa51d16e0c53b3cd2a3a0cf170e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' specifically flags a link to 'https://childrencareandliteracysociety.org/userfiles/files/jejifexom.pdf', indicating a potential distribution point for further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://unesco-mediain.cz/fckfiles/file/notumu.pdf In PDF document text
    • http://yfatc.com/userfiles/file/mopilemedokipibufagufen.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/dasuwimune.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/roribubinomebudamane.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b267c190d087b65e671e8484eb08777/sibufoxitakivim.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1701505212faac32fe3e434ab6df30af/tesofosazezova.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/4045827690.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jamifukamudal.pdfIn PDF document text
    • https://edarky.net/data/file/kibevegafikapilak.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/73b92bf160e05f11c6bccb9a6f17d17c/kosunozejazasuvufuda.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/xexopunogadonalewokus.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160954c47e3760---kevuvo.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/33131649148.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a366a6e716---xemanifinubokipatutiliw.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/foxikuna.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610eca6f81e59---gujeniwu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161101167ca520---81071069600.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16103d9ac08eb4---topazafodowox.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/jejifexom.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/37846590463.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/29683334956.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/litujorobabipoxizofuduret.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/64451687825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=baseball+rules+pdfPDF 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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 17504 bytes
SHA-256: 521ab542d1b0980b7ef46a7e9fbd5631aecd25be2a628e03da3527577fb8b113
font_01_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 10368 bytes
SHA-256: f501978dc792a040ea7436f1bd7b0b2d8c9216d86d7ad84f3babfba1d28d3a8e

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