Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ab4b0602fc4d3c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 01:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a1a1bba22ec1bfa2bb1426c1e34677a SHA-1: 707f97dc5ebdab24eb6ad288f3ac25a1ef8a542f SHA-256: 99ab4b0602fc4d3c90b06876c62116e5d20f5b66a2e914ab0255b2426b0b74e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. Embedded JavaScript streams are also present, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=in+note+1+vs+redmi+note+9 PDF link annotation
    • https://officialbacknumber.org/editor_up/53823659021.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/mubazudikukopav.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/pewemabokenakemos.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/bowoxazefiwegutun.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/dajoxarodifalotexotenobu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135743d9db68---11548518969.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/12136510375.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/46449338991.pdfIn PDF document text
    • https://afayl.com/userfiles/file/wixoxitarosetonel.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/10754468828.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/73520902030.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/sawovabisoradifoludasuveg.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/42460472960.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdfIn PDF document text
    • http://unityproductions.com/upload/files/devonugibewuk.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xukabot.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/lisevefo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/58612924926.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/minubobezuxiwijexemotutub.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923810a477---dupugemalozolawozere.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/takuwidagasidefanexuset.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/figiz.pdfIn PDF document text
    • https://istanajp.com/contents/files/79290852998.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ae0664f5---72668136567.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/76713442919.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_off0000b586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 15676 bytes
SHA-256: 51cf435686c2d8fad1efb1f520074572661363e930ad5ba12a4e4ecb68048440
font_02_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10436 bytes
SHA-256: 5ea1204be17b1b72cc73e7d1af56e723ec96322984d7055c351b7d56ca3bf08e

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