Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a3564651af0211…

MALICIOUS

PDF

88.3 KB Created: 2021-06-20 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7feb2f26e31cd4f50e15f282ecf20153 SHA-1: a7a064efb0c6b070598fbf69d4d89193cdb737ea SHA-256: 78a3564651af0211e154b5ac0f50d9dd8837e9051fea5b1f5dc99d403071e225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. This suggests an attempt to distribute malware or conduct phishing by leveraging SEO poisoning or other deceptive tactics.

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 https://floraplant.gr/FCKeditor/userimages/file/nobevuk.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22dd462c---jepirevitib.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-6/20210606065735956486.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677a35886---39892377383.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35f11d6f5---91361196540.pdf
    • http://apsencollege.org/test/fckeditor/file/murite.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d43b43fd4657bb86a39b0446704d3fc/roxemegolexavoberubosej.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e89bf425a8aeca40deb1f1eade7cd1a3/sobomisawiz.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c73557098---davidiluwade.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffe0b3f0e---diwiromubaxodelatexar.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9741f5b9---gokapobadomumi.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d364325f4d---xozezifiloxuwenup.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9e85f6321bf9b113298d89f319eb740d/wusaxesasejuvuvinevejinuw.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f006253530e1b0eb26ff57c7d590c49c/76325441500.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lactating+mom+xxx
    • 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_off00011fd3.bin
7810f8b54a4b83a3267a938cfc018b113e76bd42fa3ddaee2cd69f72f49b24c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 4820 bytes
font_01_sfnt_off00013033.bin
8ee2b7adf5e7ccc90f42940c42e0777821fc59f7743155c3e90fe00171a533c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 10684 bytes

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