Malicious PDF — malware analysis report

Static analysis result for SHA-256 03def5f439d3fbfd…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 05:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 298b7f2f059e17ef78b0e3c79474114f SHA-1: 40041d37cc33901c07f58d24dc2b919b8fb95251 SHA-256: 03def5f439d3fbfdd7444f06dc726da196ff0d909223c286e93bd1ef95f3c6b5
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 numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and unreadable, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://exlite.it/ckfinder/userfiles/files/93717623380.pdf In PDF document text
    • http://asztalosweb.hu/userfiles/file/69700963821.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32378210430.pdfIn PDF document text
    • http://fitviewer.com/files/file/voravodotewulexaguzimusu.pdfIn PDF document text
    • https://dom-titan.rs/files/majemizuz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/ravobegokemozafogixun.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/192927279961491a1a8f2ee.pdfIn PDF document text
    • http://terrietanaka.com/library/files/zadab.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lolopitetifivesinilunevag.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lts173paa8prns1b63ntl32lpm/8324023953.pdfIn PDF document text
    • https://micsys.in/userfiles/file/fodupopanalimifebirut.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/buvozewebobebaweba.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0c4621b8---16424436634.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/11422164545.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/lavikugibizosu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/lirobudelibejapifixu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140a03aec420---furopizuri.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/dukomegizodeliwamosaw.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d552faa9df---61273657619.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22703aa4b---26102786952.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/mofusabusedoxe.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/mumadumasowugevadusol.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/25787004839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=owner+of+android+operating+systemPDF link annotation
    • 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 11020 bytes
SHA-256: cdac771c07e1be85c174dc8f5fa3b84828fbf8bfa038301d86d7f52a103e0449
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 18180 bytes
SHA-256: 29f418c774150d7ce7f96e2de5550e55f1509946c3c17d727e26413c9bd3f080

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