Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11b12a222d7b070…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 12:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4dced9e859925160e84715adb2728bc SHA-1: 0b67443e887bbc5c9c882dd550856967d4f1e1f0 SHA-256: b11b12a222d7b070711c674cfbc0cabefa75326658d0cea7ad0ef26bd8e73bd5
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 sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document structure suggests it's designed to appear as a legitimate file while serving as a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=airplay+alternative+android PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614401c0be4e6---faminapolubikazaxatelu.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/57438984000.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zawevibexetoredarokol.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/vonaneveruruwolazuberosek.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lidurukovulugelabefapesex.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wufavanetap.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7a47743e98362fb16c529d56c46fed52/9860144656.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wofazig.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bipojuta.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/92732646276.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l3bgu2fdqfth9813nes10f2pgn/lolavedafenawaxidi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zemagu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/pidowugulub.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2073194779613cc93c41fa0.pdfIn PDF document text
    • http://talleresjpg.es/img/file/99777001548.pdfIn PDF document text
    • http://innersolutions-uk.com/file/46878602930.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/vowiginagiwebepoxipif.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f9634de9---26678688945.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/tibusotisuvofumanowawodar.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/mifurijinapomulunixoturo.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/51072771099.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 17180 bytes
SHA-256: f679da8ac7e92e653c3eeca1e96eba2206bd3ab25273c5468a04b73e0d75bc9a
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 10376 bytes
SHA-256: b66c6ddb93aa8d76105995f2134f20f6c6a075d48633ad95689239df72e204a6
font_02_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1