Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d4588c95525ae2…

MALICIOUS

PDF

94.1 KB Created: 2021-07-16 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6292d1a1226a17fe824a05c951f1e5d6 SHA-1: c6273f70c4ee982c1dda677d15510f031ef08f55 SHA-256: 05d4588c95525ae238c5f848e270cc642701ddc74a2bc7e38947db5fc5a1e780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4ak3k5mi5jsk1a7qgqri6m4h2k/xupoz.pdf In PDF document text
    • https://makanbanyak.net/contents//files/lalumodowidewaruwid.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/mikavazegokexixidokaniz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ebe68c4a3077361cefe5e6fef84a9f57/48325383916.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sevumurimil.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0ae285255d04cb0fcd25877eb0175373/29405997197.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/efe421db34396a682966ba299e47b614/77344517108.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/lukawemimuvu.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tigawebidun.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/tujepurutegeriza.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a55e17ae---pawesarukugijor.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608593faad8dd---rulukel.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hamnfe5sq2rcbecl81qf11gb02/34611586405.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/37023175099.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/loxuziwifiduwulejojakux.pdfIn PDF document text
    • http://jaika.in/images/documents/files/28201678748.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9f57abd1---74092023965.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mrretg944g76c643nglk61mi04/ritevuwusumaxe.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb1db3add---salibunuborubebo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sizorar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=non+binding+price+ceiling+definitionPDF 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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 10584 bytes
SHA-256: 8b2de73d6dcc02f22493ffa5752465c553952edc158f8cfc1497e17341e06337
font_01_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 18404 bytes
SHA-256: fdf710ec86f86941e8af60938eee17bb125689066bb2924f8c5565a6251bbe62
font_02_sfnt_off0001535d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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