Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55052b98bf7abf…

MALICIOUS

PDF

98.6 KB Created: 2021-07-30 13:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40cc6e45bbbddcd68a604466c3514b07 SHA-1: 5e32f0949580c2fd4e4cc076cc9846368839b5b1 SHA-256: 2a55052b98bf7abfa8140c9f5d9d07e461f2b4e1f7b37526828dbaba19368939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=sony+vaio+laptop+bios+key+not+working PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l3h8krksv6v0tpj3t36v8pul61/16716807011.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a615ed2f---40402319256.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vfvmk2e0cgrh8fv3mhmoml0h30/59015939330.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d4psjmjdv513o9er4f6aait1v0/98401981766.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c0f7crsu787h63c120bo1svk8s/95377713548.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xawepofovape.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37df5447e7---tekoxerojit.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/lawisulowovi.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/zedakovub.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sobogosagebo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/16530650756.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcacaafc2---vuwekosijawi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fed2377cf---8794884948.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/2098558405.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/40519127798.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959f34cbfcf---71625298270.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334ca04d10.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74649528---73842234775.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/92003921589.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/feb9b439c17a4ea97855cc6ef53bad71/weregepibebuvijawejewuf.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/68455713022.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2d17f46908b97507d95f6c9386dbb244/98755838.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/masijorawux.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986b1b3e849---xaguwi.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_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 17788 bytes
SHA-256: 5ee74894fbcd753d34d8df1b5743a3c7d66d50f586b19ea12686de64214866c7
font_01_sfnt_off00014a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3F 11000 bytes
SHA-256: 2dbb9ff0789f994fe992e0b357d4a64b6a9b1a3b9cf125d9311cb500cc309ff5
font_02_sfnt_off000163d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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