Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce4e2e614851769…

MALICIOUS

PDF

101.4 KB Created: 2021-09-16 05:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26d66970dc664b24b6cd45ec43ea9f6b SHA-1: a02eb3e9b59680f13599ed14ab752ddcb206ab51 SHA-256: 8ce4e2e614851769b3589ef309cb7ae1850e748afa4607f00f8872dbd57076bd
156 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 functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=is+malabar+spinach+high+in+uric+acid PDF link annotation
    • https://bandai-k.com/userfiles/file/34987358480.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10425909653.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/vetorurukuradiloko.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bbf4b4ab---wukilarasamafezo.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sudawujewiwilokeden.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/96825836206.pdfIn PDF document text
    • http://labotinnghia.com/img/files/zaduxulimirapulenevon.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vozuxaf.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/tolemunu.pdfIn PDF document text
    • http://boldogelet.hu/media/volaxufejowila.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xesoxoruxadupuxiremeke.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/nifowigonijabudebuwisero.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/pewotesodunolun.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/72872371187.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pamaxeze.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/mozuwiboxanuzodorosufem.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/76804673187.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05b26c4e7---91288811020.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161370ce3e088d---topatopafuduwigafop.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lukogujotuxamipuvifedi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d01d66384---48573495158.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/8569593031.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_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 10800 bytes
SHA-256: 0fdf7a84cc41e3d15e2633a820d9e56937f0324b73d01d7c8686f30f4109e42f
font_01_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 19168 bytes
SHA-256: fdfa741489786fae62da7b1d75325268601b2f26a062784aa6adac755a74e434
font_02_sfnt_off00016fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1