Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e8f65b0f4223b0…

MALICIOUS

PDF

150.2 KB Created: 2021-07-07 00:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 98523346f4d3e83a4a4a3a7d9572f438 SHA-1: 1f92099d9196ce8897f380e843e08a19d2125832 SHA-256: 05e8f65b0f4223b0a4ffed5bd784db872e2e449bf0333f2d4e1d144e00ea3c35
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a campaign to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=ischemia+medical+meaning PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/f79m75l4e2i112046p6l2rknq2/86813529030.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tr8t4tdeidmpsike241c33cbeo/65325014275.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/sujetabawaxaso.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853ff17197b---gafafereduzekikojuforur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m238n5t440bsp11kelghqlr7l2/jinukajuwuxarugobegadov.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c1f6a5b1---dizofekipewuwerutujapem.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/gupanivokudejujojodotixam.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/11257835235.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vigozoperadi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0507256c51ff863c6245b028b9bca911/banuxukavazovazetu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d49a2e07---nexuwokog.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/57f933a1d9ad0198c39c68dccaf747af/81842383377.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dagujusajov.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/17591046135.pdfIn PDF document text
    • http://benrassam.com/uploads/files/50055770672.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c7c07cd0ff9ffd215141447efa08fee7/17051160821.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c0dedaaffce72a86301079aa64d99a9b/jedajajegunarag.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/10385803543.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/82369475014.pdfIn PDF document text
    • http://bjallstar.com/upload/file/50880162984.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1719765ff061e4dd939a585a2980ed76/pavututigikolupalurepade.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/lefivapesapip.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/34802069047.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aca2b516f8a603de224d52501dc5892a/vamidixalefeme.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_off0001ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3B 18408 bytes
SHA-256: e28a2a93f8df389061f92179295d14aae6a949e04dcd7fa7edf774d94fc403e7
font_01_sfnt_off00021a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23265 10452 bytes
SHA-256: a2d71c838ee1163532895c3d93eb45f85255a4db613b44d911c6b9153f50f1bf

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