Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71ef07bd649c86d…

MALICIOUS

PDF

83.8 KB Created: 2021-06-13 15:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1472ae8891d245e3b8d1c0dd5c4cfe0 SHA-1: af19f20fe550f4588f95ae6d50389acbc7004b88 SHA-256: e71ef07bd649c86dee267e7638219a23d20965e58f17603dea4ccdd76a260dc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a machine learning classifier and ClamAV. The numerous embedded URLs, many pointing to compromised WordPress installations, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=mature+tube+mature+tube
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6t2bls9jdffmvtorkpppspr57m/34978695162.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d7458bcf---66682614217.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ccdbeea0---15313239340.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbbca9bcd---vaketamupedofesejomidab.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609314a01e61c---20706590365.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6164daca75---9645554921.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094076912fa4---sapigetovelimojufetafil.pdf
    • http://shinies.ru/img/lib/file/bufewuputesufeniwad.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980f0f5a13a---labetanalegoj.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c8378d3e---66557401000.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf3c098a8---bepoxizip.pdf
    • http://apexibd.com/uploads/fck_uploads/file/48605274211.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bc2ffac4bbc27ba771b9d4fae9dab861/kezewazixuputovibekul.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/c96fecd7756c188b9e2be266bf954615/71639197282.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001066f.bin
236b23fc4c69410a1d90a8f691bd9111e03dd237d5a786ef4cb31eb6daafd6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 4384 bytes
font_01_sfnt_off00011549.bin
012effbfd2e936ef2f48445c9322e99ea6eb8a073992778a25877f7ed32a6d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 9272 bytes
font_02_sfnt_off000134a1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 4324 bytes

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