Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1cd6ae258b51e0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 02:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b21f05ddbd6e76802eb924b659c9cd4b SHA-1: 8ff241eae34dae413d0b923f093a9559016efda8 SHA-256: eb1cd6ae258b51e00ad3ffeebd9e39f01d3347b5ccf5a13eb18f4d406770b6ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=tussam+app+android PDF link annotation
    • http://favorit.pl/userfiles/file/pilamifogebuzejavur.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/xubusowazifuzibivegov.pdfIn PDF document text
    • https://totounited.com/contents/files/pefubonan.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/dibulusavinuxofiju.pdfIn PDF document text
    • http://sergeybazarov.ru/file/58846426785.pdfIn PDF document text
    • https://pcetravel.com/files/file/28065901526.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/aioh6rocg5pcl4c3fpb3sn9ejp/94254289685.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b5d2845f0ec8abab5f3a5b35eccf5618/94529490003.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1b4413b6---83133917942.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83562108236.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/saletib.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/ledupazebozefixu.pdfIn PDF document text
    • http://domosplast.hu/files/file/85796838516.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/rabezaboraxarorifawofo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sqkv4gejud948elmgvmf5v3hek/87211818042.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/85036676949.pdfIn PDF document text
    • http://adriennemason.com/assets/files/67551912247.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/20845406373.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///podusudavusoj.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/16631979438.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/wezigagosi.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kugubunekizadup.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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 17236 bytes
SHA-256: e7360713efb7ccae4feefea2309be54c4607b0e15c106f0f75c5810fe097e7b5
font_01_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 10340 bytes
SHA-256: 3c660e83029f92bc197605bd6e1910402021097021e18ed4564c4d20f45c204a
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1