Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab48229e35e74c3…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 00:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5ed67f88cd53e32011787358388869d SHA-1: c9d39e4c09893c45134c56b81911947082078b80 SHA-256: cab48229e35e74c3fe7234ab0a9cbb40b8ddf140668633be2ff8113ff4287e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and a link farm indicates a likely attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=sonic+download+apk PDF link annotation
    • http://csc020.com/userfiles/file/20210926235701_zivoje.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/lupop.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109061009534696.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e280a3d37---gufuke.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/64b69ae36cb3bc0affa17afc383ad5b8/zurelatepijafokeretison.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/84769901566.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210908_EC536419BF4EA880.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136339635473---82957969326.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/duwavunijamodanujiruguw.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/22243130163.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/91927215623.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/gorasibu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/78799814807.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/28667739460.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/450303_tuwejixof.pdfIn PDF document text
    • http://maidichike.com/upload/files/70196887206.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161419cfe05215---xiwexogexo.pdfIn PDF document text
    • http://sivam.pl/files/file/tiwivozabe.pdfIn PDF document text
    • http://sns.hu/_user/file/xidefebikuvotejowudeg.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/zopugebotogun.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/64241366764.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e61584cec284bf861895d505e6bd9257/6194819290.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_off0000ad6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6A 15060 bytes
SHA-256: 7986cdd6e9443dadfe749918958c401ac6a68fea61b4b361d7a23f8e97efef20
font_01_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 10260 bytes
SHA-256: 821addcbd84d3fd6522914404dcb2d55bc808b888562c6669a22ed6df0e1be31
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1