Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ad4bc58ff326e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 01:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf3f16d6a3a59327261980fcc23f98fb SHA-1: db7963ebf0a2c6f468d03c1308583233fef3326e SHA-256: b72ad4bc58ff326eed4758dea917c93c34f6adb8c4f17fa8f6791db4a4264ae2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=android+battery+voltage+app PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/74d85de323887135b8746b2d1176663f/talariguda.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/90224679167.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/vupadakirugarig.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/53313338090.pdfIn PDF document text
    • http://mayjack.com/upload/files/30774738633.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_CC2B56ABE3AD8116.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/neromoxelirovuxenugex.pdfIn PDF document text
    • http://sireny.net/share/files/45297668481.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/maxujetuxelodemapugi.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/25349301064.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fubipawutuleduwixoveb.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/jolog.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/27184662846.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/50354063545.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/65883948431.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekumuwumomuwiror.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/80998680691.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/numigufumugilotefepi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/8698495546.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102b17ae01---dipuxuvevizakovafe.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/66467898868.pdfIn PDF document text
    • http://haai.org/upload/file/27053481491.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/vomumi.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/4359424657.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/terugaxawo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe68d72e7---gexoluxapedopuba.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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10700 bytes
SHA-256: c748479865c1f1ebf2e260b9a107b1c0ff2539a83e78e8a3d5312091c9fc3705
font_02_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 15624 bytes
SHA-256: 14002426cb9de89862ad2c44cd461d31bca1cff62ebedc579c5b817c02ccd04d

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