Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f32a1c27db9263…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 10:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3325958a843495e59ec0b89e2293dcf SHA-1: 184f769c2f436be3db636ad296be28d1b467aa47 SHA-256: 68f32a1c27db9263adfcce9c9efb12f1b5d9882876b6225247f4a2ec4715cfb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload directory. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://alarmy-kamery24.pl/userfiles/file/rujunagivemitadefoloz.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fc9d1fad85108976688a97605967a00/juwexagivejuzesimebigomed.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u2fu99fq3e0i27uoatgpmqtsqb/2571237868.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zekevevosobarikanidimo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7a5c2ef1---vonavigudesavenoba.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/94009579272.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/44233039371.pdfIn PDF document text
    • http://hrudolf.com/userfiles/78125775201.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/13927125251.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/gofejagakedobowodatikog.pdfIn PDF document text
    • https://binhvi.com/upload/files/33945009017.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_140102.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/tufalenojosaveba.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/naleluxowalo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/91387225162.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/48078562694.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/98707944724.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/77997414221.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/29995420682.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161397ab7546e8---41194368622.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/vifeluveli.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/34362835150.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/zukumudupekiral.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/42668993004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=speedball+2+evolution+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b484731758---84260633736.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 10716 bytes
SHA-256: 8c0858c005858ced0a3b5f697ab09d3d3b0ea27992dbe74d244e4d245390e346
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 20144 bytes
SHA-256: 918dce94805e8b68ca7761f69e10cd57cb5da87b3dc84f061eb3cf871ac6bdb0

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