Malicious PDF — malware analysis report

Static analysis result for SHA-256 2816bd3b235625da…

MALICIOUS

PDF

72.2 KB Created: 2021-05-16 01:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aa727ea020e7effc99d0eb2475ada69d SHA-1: 83fe94934b8a5bacedb20ca7bfac1291802886da SHA-256: 2816bd3b235625daa7a543aa4ae9c5996f89ddc4c8786be4330d103c8c2dcf24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to distribute further malicious content. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign, possibly initiated via spearphishing.

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bf81bc2a6c832f2056d1b20cf2389ecb/49590990103.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/113596f9879fec865787bb4c1651bf96/27862766119.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/782fe6410da50e1b717fd8de8304d5af/68285446305.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586a58e439---pibesediravefowubore.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/221tc36opq6ba0r45cq9qgenho/befujivivepelubis.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca0d564e4---46168221359.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/86376074513.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4877f8b170390cf068b7c8497d80729d/gilasadorijav.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/jimadupekimefosedubitan.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160798446e5feb---60148497729.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4d31b71e58ff84543615b480ff7c9e/17761314329.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eaafca6ce---59583281943.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3275114785d67728eb56e35108d000d6/21548251619.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/olbjv76v37o9ig7sspfil9gt7j/24433304617.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf283b508---resubivoduxitobexogox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=formule+r%25C3%25A9siliation+bail+vaudPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 5152 bytes
SHA-256: 408e55048651ac3a540fc9da0346d14ff946daaf1f0522a5ae6a58ba2bcbf54d
font_01_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 11508 bytes
SHA-256: 9c59ba2d45e93669855be1e09cc2ed4a6585beef595bcefd85052b5cd4fc8fb5
font_02_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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