Malicious PDF — malware analysis report

Static analysis result for SHA-256 896406805f96754d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8af019dd3c556712af8f91e716b7caed SHA-1: 6b151aeeae0b8b1b3f169218af9c4ab60052d19e SHA-256: 896406805f96754da8564309f517108e81825054ea32705b01d82da225f14a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=download+squad+strike+3 PDF link annotation
    • https://hgindustrial.eu/userfiles/files/16480053640.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613434e763442---xabepifenezojagijonuje.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d051fea1fbca4031e20ff4fc4c9b89e7/2043066835.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/87134396900.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/65078176573.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/94369359035.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/busixejesawomil.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/mofagozuwimut.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/64453590580.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/31349478054.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zexemenugitiwavitubibuvum.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424188567ec---marikekotesafo.pdfIn PDF document text
    • http://clickvay.com/upload/files/45614115569.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614410f53cb24---45694411661.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/baxotal.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/99244207505.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/litotozebi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/33602373758.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/ruvepuruzodol.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/71599599679.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/4718131859.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/ximunakuxemafixesajopofom.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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 19376 bytes
SHA-256: ec88893bfa44b5ab19cf2cd0f4d2bbef484d4e85bbf83afce204459b3f114ebb
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 10840 bytes
SHA-256: 748e7476e8c4f418920e73d7067150400dc2defd3630d9e3c45d91589f40cc0b
font_02_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1