Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b65e544d07ab91…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 577cff656505f5223bcb2ae93a5545a3 SHA-1: ec7068be4a75a035e0d86bdefbc776c759851f38 SHA-256: 92b65e544d07ab91c6396c050002b98ef7dd82ed48324b8689970aa67548c67b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on potentially compromised hosting further supports its role in directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=rotation+around+y+axis+calculator PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4a45c7db9a16e275ad982a0927c1b7a/73507161875.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210623_BB8B451E248999D3.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210626062925_f9e3fg.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/abbd58eab64958b7619ee8eed2517f95/niperuxusifal.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607144295dc4d---34543317460.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160747fa5379b8---rusulilugonugezemipa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/261e4b6884f1b9641d194dcb41f84a69/kagixob.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cmb8a3l3jl7i87qgel7odfmnun/sifav.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/roxojawonaduxorizumo.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/69963031523.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/luwupenufekujumol.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/637818ba96a7cc9c0f369fd82d9d17fe/3437498884.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/60838739985715cadda38403770b9b86/91375899850.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc5807775---lawisakebizib.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0ovk1fklqorv1sunc7dirdqn0g/90337612616.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/nujori.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11946567b6766f0388445c3df522d3bb/84917340421.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/widusulapu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078843456d---fopakireduli.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zurobefi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f6036be5---zebisoge.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c867c20f---13130610848.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kenileg.pdfIn PDF document text
    • http://www.polni.si/Images/files/ponad.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3ee07cb84c47d1a546bb78991007fc98/niwowutis.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16404 bytes
SHA-256: dbc4be6bcd1b5ed6eb1c15da7c3f7ddceec1205f4a7d7118b98d0de50a45dc05
font_01_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 10592 bytes
SHA-256: aeef118867cf29dcd7e7fd108b7fe4cd9f007802287d976c7640b8191fe38362
font_02_sfnt_off00013218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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