Malicious PDF — malware analysis report

Static analysis result for SHA-256 74626d1afe1e43c7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 02:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4e3d3874d517e04ddffe2aa06cc3343 SHA-1: 8fa64ef4c43197ab723186ef3ae4167a0c5b2d6c SHA-256: 74626d1afe1e43c71f0aa79b743aebb31f28e7f1ae8034ad705f8788f0fcfbcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=best+football+android+games+2020 PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137347f53988---31239864328.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/6217455746144ba5b04f7b.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/65710482401.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/larafobivolevivaririjid.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/71621958256.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5fbcff04---vibetogafikiwukejadomu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/defigukazogusalatijadebem.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9qcrouh1vhvqbfk7ev846qoa04/51821609539.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/55790093831.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zonojufajunijekigixojer.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52419014657.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nalafoxorijimikuf.pdfIn PDF document text
    • http://knipia.com/userfiles/file/9647798422.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/76902320591.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xudagodadosaje.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4ec065bc---daxaralok.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/milifajowe.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/89689287865.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/tudalilofeg.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/98739025400.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/4383603676.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/novaniripozaxo.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_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 11132 bytes
SHA-256: ddfdbd74157e0bd7534b922fdc592a65078dd51c1e3faec652220ae7a58e94b8
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 17524 bytes
SHA-256: 541108e83a17fdadbc21f1af06c26e063ae539c283526d64d67413fbd7cd1b86

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