Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd1a3d136a6ac0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 00:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6db442d7ef6204aaee5468b34c4014c SHA-1: cb2d27233e4b9a2cada5db55f45fa3504d5a2cf0 SHA-256: 28bd1a3d136a6ac05a318e6a28b3ac9766e35effad796fd049ce233c76d297cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://teknis.it/userfiles/files/wolukoxalareviwiva.pdf In PDF document text
    • http://bantinnhadat.com/users/files/jeviseta.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/91664857259.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/70253698776.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/88314492815.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1846ff00e6---90261695831.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/23953458330.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sixizavonuvajir.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kowazunogegole.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f29f88223f52551a739362671f935fa6/milotubanipejipa.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///waraturefosujow.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/32713011596.pdfIn PDF document text
    • https://bataretak.com/img/files/file/10815666106.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpeovllmo1tneq7uihi0og909f/65950354027.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde7a2630---33250755444.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/85156987508.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kazowukiwurikizabuxe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5d76e433---82588015673.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/81438939127.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jiguwiwifinozekinekaxalov.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/41249435110.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2f3cedee---54546524209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rpf+constable+recruitment+2018+application+form+download+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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 17568 bytes
SHA-256: 300c290a4efdaef283d53ab6a5a2c34613616575777ac905363fceeb7b23c076
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 11656 bytes
SHA-256: e11c56fc856a260268c81f8477accdb1765b25ddf418277e27322cdbf50b4e1f
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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