Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b85932b637847b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203f77514d1e07802ada0bd4dfa03c63 SHA-1: c4083035a96bc892732d5737cdf6fd7f71b7dc61 SHA-256: e5b85932b637847bd8b5777fc1763a708bdbf1f6b82010e3292a62b626d2a851
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites, potentially exploiting vulnerabilities in their browsers or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tienhasteel.com/app/webroot/upload/files/gopemixukoliwisomoxenir.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qvvv9b857uno8dinbif7abm0gh/53586510568.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/71682705840.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ce78b6bf88e0c64818c1b6c27c1f1f28/binagonifufat.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8998207c---77563672155.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/23045460616.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8874f37f88b5fd8370621463e911ad03/zisinimeje.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6d9ba90def28fb786e60376e4630f86/31644147592.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/vimesubitebadag.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/benadopagodugofemixad.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tr7avobh8si70e5kfdar0kn9vr/xaresudumowuj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079427c6de1d---67228882581.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c3788282---87948396102.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o009bnbvijk9oq3quf5liqpfl4/33326021039.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/62167442970.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc83bc5f6---zuvujosixovow.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/piwuvimatu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/62177125683.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/gewuxipejilezegogalexub.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21046dd34e---paguvesujub.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949d55c011---xomapitabak.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbebaf82975---lobelisikijewewo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c84450e10---sidejejagif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rational+inequalities+examples+with+answers+pdfPDF 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://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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 11240 bytes
SHA-256: 2af51604d778e30427846c05f666ceff56e755c970097a7a500b3285132a809c
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 18512 bytes
SHA-256: 81307b3a86767e27056f3656055b3ddee5f58c8472f5bbf88473b93ba523c4a2
font_02_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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