Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb05a5a98b394951…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 14:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4efd208037fbe576ff267f97585d7b7c SHA-1: 43058dabdd60b2533b054a4cfd6af03819793126 SHA-256: fb05a5a98b394951366efc608f6242eb2021bd675f11fce43448828aa2e0bb45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various download sites, masquerading as a game download. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and disposable hosting suggests an effort to obscure the true origin and purpose of the malicious content.

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 https://synerhu.ru/uplcv?utm_term=pokemon+sword+and+shield+game+download+without+verification PDF link annotation
    • http://fli.edu.mn/ckfinder/userfiles/files/dezujofimazezej.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/90850128322.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/14927136018.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2c3b1e9755e7bf722ae33c3f8bb2c7a8/zevafajajakuduzuwufapex.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/11763920389.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/45716693835.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/54368729904.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421baaae484---59885319299.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/wamonimezudiputefedimex.pdfIn PDF document text
    • https://tpk-m.ru/files/file/depexalegejijajed.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/70013502256.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/dezigunuma.pdfIn PDF document text
    • http://azizolace.cz/images/file/18854104002.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bonemigorefulute.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/45565333899.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/53586734981.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/1804058606.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vhifnv8tguu600t8akut1m0do1/36529036311.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/14295348004.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/dugirobikikopogoved.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zetuxamukiretumigogujejax.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/68727124523.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wulukosaxuvunepakaluvezob.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/96158767461.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_off0000bdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEC 11268 bytes
SHA-256: fc0660efeb9e01110a4055cedf27fe80b04679d46690cc402c356bf710ba09f5
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 18040 bytes
SHA-256: 1476cfa3cf7846e6dc668593c1e03f53dcf7422b4fad8b7e6d13a198edaca3f1
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1