Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e90740268144933…

MALICIOUS

PDF

93.0 KB Created: 2021-07-23 22:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16b2509e5a31ac1405918dbe7b9f7563 SHA-1: b2e9181362a8a2cac677a1103636b39a5bc3ea28 SHA-256: 2e907402681449333a5707ba1a3673835ce45fb54fbf896b2fc5516fde1694eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160caf498abfa7---fenusutakejezobumifale.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/tudubifeperitavu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607298a7f2961---zimiximabofelutowar.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/jazanosulafug.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cf80c8388dd87926d4517f34cbf5f0dd/kivuwukedupuwilodaj.pdfIn PDF document text
    • http://juha.be/_files/file/sadanebunuzafosifo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/7806747042.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/82189664708.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/843bb7fdcb35be49a61146a269bb19a0/89962993192.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gagikejigoxedigi.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/koninutovokodagebuxum.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/sigoxegesejatepul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe6d2ddef---67082208571.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wanidowip.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/57dbc68afecaec1020618f365e14d5a6/kuwedenaxatixatutasuzezo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9781b29a08---lanuxaxabakux.pdfIn PDF document text
    • http://fotossc.pl/_files/file/rimepasituna.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e49d3767---19700611863.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b584617---6462486608.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/mivovotefudanudizol.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/govazagumexe.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/jiravuxulifewowavitaz.pdfIn PDF document text
    • http://tmfconnected.com/clients/6/67/67cd703e63b47da0cba1438f70967d25/File/kebegijulariza.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=first+person+render+mod+mcpePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10444 bytes
SHA-256: 83c54498b4e71ccf1cdf2fb7883e2ccc064d68ab4db3bb3809a1108407181b72
font_02_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 18408 bytes
SHA-256: 320159c6d3784d9a6d4f0f79642befe925a078b2e5f71209012a9a77d4af6952
font_03_sfnt_off00014f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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