Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d62e9f339ea3779…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 18:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 436a110552e3b27072e5123f51d6912c SHA-1: 5ced733ff2f5a761549aee24b9f2956326ac2341 SHA-256: 7d62e9f339ea37797e2685165982669d02eb6e39949325ad7136e5ab25aa21cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=12+tenses+in+english+pdf', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=12+tenses+in+english+pdf PDF link annotation
    • http://sensitiva.fi/UserFiles/File/ziwevefemow.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/87513633375.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/lugamuno.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/71873957881.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/80373949271.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nulifujalugox.pdfIn PDF document text
    • https://33mobility.net/uploads/files/92909583576.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/93838650423.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/siminimipoburuze.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/44532301307.pdfIn PDF document text
    • http://dkind.net/userData/board/file/46776576206.pdfIn PDF document text
    • http://jainfarms.com/uploads/33611948905.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f283b168d23e1bb1a9e5370739106b32/ziwipimoxizodonivipifaved.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/36020481481.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/mewigixuralabukozu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161312f6e4d2e0---dakojitinexomomozewanopi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e932cb769---sobetegetikuju.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/gijaligoxebeza.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72adb3ef9---4727344737.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/pamotesujobit.pdfIn PDF document text
    • http://talesma.com/E/file/bowalakotema.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c9bf03ab0d022df5d4cde42ba5265023/46740419677.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/31685310284.pdfIn PDF document text
    • https://jensbrode.de/files/file/4528799097.pdfIn PDF document text
    • https://digireg.ru/upload/nikaxojepef.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 10468 bytes
SHA-256: cb7c6acaa893007316b65f8d946e28bb3d7a02a754725c4e3ceb3f3dfc7a4a5e
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 17508 bytes
SHA-256: 91f70569bc1bd2d99937e8d8dfea34eb29081b5b7ea5c7ff6ba181763443c4d9
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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