Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fb72edc13cb047…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 09:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 122275664a96958cc6e8089ac1b0d6e4 SHA-1: 0e6b18c72c2908a17e819bba1f49e210fc43e1ea SHA-256: 35fb72edc13cb047a673eb94e4588bc87d801e947022f8f1a2a8b4836316caa3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's part of a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://chcial.ru/uplcv?utm_term=cordova+check+internet+connection PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbd6b3ef5---48198566329.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/vewogipagoxopuruxuze.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kusibagusepen.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3717b7e75---lefemeto.pdfIn PDF document text
    • http://373113.linker.tw/files/11926151128.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/53133078364.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67983800772.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/vaxexafilos.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/89744028067.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/zofibosivoxokop.pdfIn PDF document text
    • http://servmed.net/userfiles/file/99246107762.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/2026715915.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/ledopapamafezam.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/38162963886.pdfIn PDF document text
    • https://tigapilar.com/upload/files/bijoludurijodez.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/47952500571.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/37866638524.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109111257282522.pdfIn PDF document text
    • http://youil.org/userData/board/file/titazobisidijemuj.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bulisakitazel.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/togusimemefavodinezu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lowerevenijikalogofaro.pdfIn PDF document text
    • http://canadanur.com/resimler/files/87503972189.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/vutebakebifuvezelo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614910fb08ffe---99849234461.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/85885777592.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_off0000b739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 10440 bytes
SHA-256: 4f54c91d1186174d18c0a31edab7b2be7eade131f90c4d77e88a01f430bdc3ee
font_02_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 17288 bytes
SHA-256: cab0cc49df10e8456437a25bdbe5c85e7fc8683a03a9a67ee109a779be97cb83

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