Malicious PDF — malware analysis report

Static analysis result for SHA-256 513b64e0cbce4cd7…

MALICIOUS

PDF

74.2 KB Created: 2021-06-22 21:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc9ff3279716e5da54ce9b3a3e3f918b SHA-1: 7b4befacd4cce9f810738139fc8b4aaddac1841d SHA-256: 513b64e0cbce4cd7ba19996e45e1d15ec7e14b273b16900d080ceb4d786f5ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of multiple external URIs and a link farm structure points towards a tactic to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://pivotal-technologies.com/userfiles/file/jewixoketun.pdf
    • https://circolodelpistone.ch/userfiles/file/9390168350.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/42a05419db500509468d4c4ce9103de8/gasawajixufo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607724061dbc2---gonakefowuniwono.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeafba4f1---pojupetiboxonukijup.pdf
    • http://daiichilogistics.com/uploads/news_file/pebakesuxovosixir.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4b7a2b1f03b7399c498cd9977418731b/91931411204.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n6vaf7takq5qjg8mfdnr3de3h4/13722071124.pdf
    • http://ankaser.com/userfiles/file/44298505887.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c779db75a960caf544ec6499f8533f88/26294548093.pdf
    • http://terralis.eu/catalogue_dynamique/file/12400124193.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090708d94ccb---kiwiwekerekexixuzewod.pdf
    • http://bannermaul.com/userData/board/file/79467691373.pdf
    • https://kede.org/userfiles/file/45111122995.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb8b60b7f---botojuvolakasasu.pdf
    • http://arniestribu.com/campannas/file/99965558171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=literature+review+on+working+capital+management+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1aa.bin
ed1d4cecaa21eaf5a064ddf6c3080a6d8db341662d397d48fabfb18dbc349e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 5456 bytes
font_01_sfnt_off0000f443.bin
d7c41f9d7689a8d07314f96adf4d0064577c7f0f4bd26e34d65d2934452d8326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 11332 bytes

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