Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cbd26026f0fe98…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 02:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3fe93955207f8eee76466d2abf53337 SHA-1: 8e6ff14551f3a8c48ae29516f3993bee573f35f8 SHA-256: 10cbd26026f0fe980d2482d278bd0d5ad85309ed77f58ef7c351c3dc4622e159
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to attract search engine traffic, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of embedded JavaScript to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 https://krisoc.ru/uplcv?utm_term=tmap+beta+apk PDF link annotation
    • https://wsbtitan.com/images/file/36078123590.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/87791927506.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/zotoxekevinetunuriga.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/jiwubugoz.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/wiseguxesopu.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/83962153595.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfbe0fe1b---10179145522.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/97188490395.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/12285205113.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/fekiredatomegoj.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xutel.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21426724506.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/29305994619.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a8cc49f7ec272cd8d1c8a866f6451edf/xajazidamasawebez.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10422b944---bopepopulutoraregifafuto.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/jovozetetagisesevibow.pdfIn PDF document text
    • http://koddous.com/userfiles/file/bifutevarij.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/76730649170.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/21575256575.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwalejivadidiwu.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5066940165.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6e3ae11c---rujibewumelapuvibile.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/60904397494.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/77680435299.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/wevogekalixanemudefi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 23468 bytes
SHA-256: 923e356146f0418dbe71dc5c802967322879a23924b705a4ca903e0a9cd5c06e
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 9980 bytes
SHA-256: 876068040bba70de960a5af167669fd2f0347a183e9719cd0fe9d4b883a7db82
font_03_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_04_sfnt_off000148a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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