Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef6434e5876a5d4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 16:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70218c9c2f95ffac33049b678777a1d5 SHA-1: 426769f0dbfd89f3acb9529dccd2ba516a5333aa SHA-256: 9ef6434e5876a5d437a2b36acb061e8f90b940670b84d73d986b32a14598f5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links strongly suggest an attempt to trick users into visiting these sites, likely for credential harvesting or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=letters+from+santa+template+pdf PDF link annotation
    • http://botosani.ro/img/uploads/file/riloxudaxeguloritujigojug.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/686eec2c60b884d051b5a1dc85fe5ed5/gajomevofusimeperupom.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa152dd14---89076595593.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/64868634152.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tipasamalidozororopoxi.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/lazagesopigapude.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117eabce6f---sudekoriwezavutenal.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/nanakuvisilo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c3ebc47f56765d8cff42bcc81be36686/99379384336.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd89ec03c9---62324234570.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/77aaa88884a2e650a1db7ca962cdc9bf/40215635589.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607622d4cd41b---sidatexikijasavofad.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/kexatexitixed.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c20e2d23641---lamigofolone.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161205ef7564ae---97896181852.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/52077187871.pdfIn PDF document text
    • http://yuhongzg.com/d/files/180507539.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/805d73a8d99bbd696be1db8427eb66c1/55309600321.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fb9238f68a2f9a633781861a73a35b38/75544811411.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094daeb9b1d4---totaligawomumo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vuwomejotakazuwemigana.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/lijep.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fgjgpgm6n75q8ua4vo1pf7kub8/dulufofipononalu.pdfIn PDF document text
    • https://chineseclothingonline.com/File/jolapuparafeduzovenodapi.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vejuguvuputizovegebinewe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/72580268431.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_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 10524 bytes
SHA-256: 12e4ec21337b15b214999c44617d228837e5486c34b2236d06b7a832d008f9fe
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 18112 bytes
SHA-256: efdf2432d89482221faddc4e3441d1b6847567e055a0df3bba97b8b42180fcf8

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