Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d0c81b8c3c2fc1…

MALICIOUS

PDF

81.2 KB Created: 2021-06-19 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d306a113219068598c90a0aedef5eb SHA-1: eebbd420f9bf6b08092568fac7e3bc01041df3c6 SHA-256: e4d0c81b8c3c2fc110aa7782d51f822aef50127974da96bdfb837306b10cf23c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users away from the document to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8ebh8pk0vbks001aqschi4j0g6/mogopipedibepurenijor.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b6215684999f7f8e010c20daf392a546/vodinesufodepiwefogevivot.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vmthng1qvor6kl1v19d3eoo5kh/zajadomeleze.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/32022601729.pdf
    • http://www.jindatunnel.com/up_files/file/nobotajiju.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/50836812653.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebb9f77c9d---fidunexosopojaw.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fea42a4963b095745743114b7bd86d4b/nawipilubapidujeda.pdf
    • https://argumentua.com/i/file/ganugelaworizuza.pdf
    • http://bluekeydigital.com/images/pic/file/mazirijunof.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef4f296c0---45467724362.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/df8bc9dc39243739f0a98d11a0a4f782/16097192884.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/82dc9ed07856ac1c4c4813a6ba3de64b/90735845204.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2308b8be3---58131546543.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/43929788792.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9bf38b911---febaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ivan+pavlov+behaviour+theory
    • 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_off00010360.bin
995dabc18d03d0541918a10489abc8b7daf5940036706b501777b90cd6fe7719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 4968 bytes
font_01_sfnt_off00011444.bin
b3e8dacab463f107b2aad97aa5bae7ff948c3805078bf6794974423d42e8b619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 10548 bytes

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