Malicious PDF — malware analysis report

Static analysis result for SHA-256 434e385e13f60a11…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 08:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4a0152d0d038f83d44410e92e5b3f60 SHA-1: cb5ac8fa51eb4d82261f5a0c285a90d8d81e8d62 SHA-256: 434e385e13f60a11a3d64228fce0aba35ec97a8b04fd3bb7a16442ed73dbee52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious code or redirect users. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e4045b25d---4012499567.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/17975811450.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fa2466724855939e8afe6a56ae838130/76190066795.pdfIn PDF document text
    • http://mp-journal.com/media/file/62923189074.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xuxovogumeg.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb084b2501d---dituzujogidadiz.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ce83a7544b837fe7a16de4a51a23e375/88215646876.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mejetonureper.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/rogure.pdfIn PDF document text
    • http://www.bandungmesin.com/file/batupikewemelilufifuroban.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/tekexatelu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-26/20210526073211269618.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/rarimopusegapigi.pdfIn PDF document text
    • http://armanetti.com/images/5364909387.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n9bmdumntd3ou6rglm0fekaa07/zupurigofavomefapur.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/rafigubolupini.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e22c4f781---getuwofarifavalavokejobod.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/64367878083.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4fa1ff4567d6db2211462f067b814ac9/befavarubopiwowidut.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c9f911fd---80156349983.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5910e7d86---vilelusitefowom.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/he8fc4ft5r2kpdicp5p6tq1co4/94945104446.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9cd0c777b---xilatevosegevajoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=meaning+based+translation+larson+pdfPDF link annotation
    • 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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 10804 bytes
SHA-256: dda3bbc82601a3baf85c71eba7b0296253b6bbb20af51a097f2985d9e458c7c4
font_02_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16664 bytes
SHA-256: 271c2f7112f48bba680d571857ef534c8f83661f82878c58cb5dd9c023352be8

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