Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d10c722ed6df5…

MALICIOUS

PDF

77.1 KB Created: 2021-10-06 19:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 58f5301206e75ac6ffbc8496781774e9 SHA-1: 77365a3c9dd5b7a3d899aa26f056b4b689e9a02b SHA-256: e99d10c722ed6df5346e44df7b69eedaee9a9f82c81737edb043792862ce57a5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript and external links points towards an attempt to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=post+operative+appointment PDF link annotation
    • https://dunaweb.co/bg_image/files/tizatawivigevebasesi.pdfIn PDF document text
    • http://puisan.ru/uploads/file/perubak.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/bufelulirepa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102fa30e00---tuvinuruxofejuz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf4a2494f1---46122863321.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/4824078755.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/63862154272.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/80791763976.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/90464155477.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/najopugudefuzevufuxi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb216309d0---melebegevobowojulisururar.pdfIn PDF document text
    • https://mimpishio.com/contents/files/57431470145.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/tufiripaf.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/torunotemorijinaxuzexejip.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/290902434401.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/32727835300.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161449e22ca2eb---63370815059.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/58646494753.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/segosu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf0d8e7b4---newugapujufeva.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/61762428385.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde8f52ed9---walazu.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/xudozonifexanavenotubin.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614710111acd5---67468050626.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/288e3cfe361fe4f453f54912ea11f49e/gavewataba.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_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 17384 bytes
SHA-256: aa713947caacda7f341ed649d9d1c96d7fea16c6a75e27409a5e8707f81c4d02
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 10436 bytes
SHA-256: 1ee2394f3f6c815566a5ec063af8f657b55cfb64873051606519a045affc45e8

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