Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8635239d7091c11…

MALICIOUS

PDF

98.0 KB Created: 2021-06-27 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21e1dc60f4353235aedbf836930b055e SHA-1: 79d99c4bfee123df1002409505cd2f56d53491f1 SHA-256: e8635239d7091c114d1357c5658f4d40070a908a2ccb6108cece466cff4cc04f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware-hosting pages. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://coretry.ru/uplcv?utm_term=right+time+to+get+pregnant PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a687c9cf3ec105084b65e9ffd92f557/vozuret.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/78177044520.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4d0ddaa09fa0c6859662784f21201add/riwoduwuduvakonaxux.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kamalopetekekulafozun.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fc23c66d---dezez.pdfIn PDF document text
    • http://abpaluso.com/upload/file/1383828325.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/eb7b3360ebcfa0a028ded50b20de4c69/xokaposejimedurososedel.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bfbc49b40---58358691103.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f4da99b---70920548815.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/volufu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac3faa3d9---lolitukuturu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edb57fa4d---16042088147.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49be52a8e---xujugokomirusot.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972c6f3d1a5---ravulavamopeleti.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82fd91e8e---zazoronopoverinudijel.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd0718690---xukoti.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d6ea0e468fda2d49217993dc3279737/biluxuka.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160937f843b940---79688758189.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d201810ea---losetifuzasoziwexokiv.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0f5b525ce279584f95c00f8493589ebe/zarifavagiki.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xenodixamebagufopoxare.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dukifizi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/19e46761f5c6680b383b18e56df4a364/rivikur.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b687b671394---54927725191.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u77k02p75gm8kiucbb76ovmt6b/47248117848.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9a8f332b874a66887836a76a393aa488/59192578780.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 17512 bytes
SHA-256: 6215a4b2c0435c7d12ba26cb371ac49afa780d0c4764265c9a1459413f09299e
font_02_sfnt_off000162b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B5 10532 bytes
SHA-256: bc3aa7ec0cf8f894cd1b56bdfbc9b11072e22b6a3cc77f6d2475803c049d9029

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