Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de71efbf56fff1c…

MALICIOUS

PDF

84.4 KB Created: 2021-06-12 06:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b669bcea40132b03a62c2a600eaed70b SHA-1: 22b282ed3006a1fa6396fc5a1afebbf8b460088e SHA-256: 1de71efbf56fff1cbe3a9c21e91fdc4d82c0bf8bbe19ec062376188a8a3f528a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'hack dls 2020 unlimited money', indicating a lure for potentially malicious downloads or scams. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=hack+dls+2020+unlimited+money
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1c8f662af374275a2f99d523d1046da6/67050595648.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ed810a97795defdebd3e0848e7a9676/rojadegefo.pdf
    • http://haai.org/upload/file/57667033895.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e410520c72cca82e1e01849c47ca2fb5/bozowexunulugomidafet.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/bh3ukevs1skt3dfkk1rgmstl8g/nimafuduvoterevasemeb.pdf
    • http://ahlhy.com/uploads/file/051852404448.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd13ced79---71233470512.pdf
    • http://chandigarhdatarecovery.com/files/file/tusurovekurul.pdf
    • http://sgpeo.pl/users//file/24257142973.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609885b92d6f2---46692937279.pdf
    • http://azizolace.cz/images/file/zenoxerunefek.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607533da0a0f6---juxavikizimodipasilux.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tg4q1mm4soio0p3ur8lqv9ml69/rinaxigirov.pdf
    • http://cesishotel.lv/res/wysiwyg/file/mufitegusufevip.pdf
    • http://sillajen.com/fckeditor/_upload/file/28495338963.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_off0000fb90.bin
9a1598c0e0e02438c51f7962ba66abe936a4454708b1f79e9f1530eb80801718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 5272 bytes
font_01_sfnt_off00010d67.bin
cdd2e6ec54e62c9e1be29669a25d1e59aaad1fe58d560079053ca8bddc564d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 11744 bytes
font_02_sfnt_off000134fa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 4324 bytes

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