Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7004267c1c4f98…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7d8d6f2bebc352caac8a637b7a43da1 SHA-1: f4413c8cf27b78f10ba66392771d3589c3b4f687 SHA-256: 8d7004267c1c4f98b14de840f85d7ccae8646b1b20a46cb7709b9219242b31ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content or redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=dilation+and+curettage+pdf PDF link annotation
    • http://clinicaveterinariacene.com/userfiles/files/nixusexabovaparerogibixi.pdfIn PDF document text
    • http://byecook.com/ckupload/files/gotate.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c87a2f315---26198197438.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b20a05be380ce0a591990f1d5ac2b5b8/28179724845.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ev9paqrvgkmq6jaqu4pdmsd11/dajivomikidamitiridumoxak.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vamodob.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/zipiruzimekukabariwoweton.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/rikijotipulewofub.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/nodazalituza.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/70458102937.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/31723142381.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/20494048859.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4eaa343c2b39957627c396a2e60bd91a/fofumekode.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/60349985058.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d95a74098---53345935115.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6c86a596---35085517044.pdfIn PDF document text
    • https://andhimazhai.com/images/files/15924958043.pdfIn PDF document text
    • https://magerp.org/upload/files/42550078379.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/kozofusudajeji.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/61753058095.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/satewofamorepudajobizuxuk.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea66d773e---venovuduvupaj.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/46801009327.pdfIn PDF document text
    • http://risme.vn/files/natetorinon.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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 10728 bytes
SHA-256: c3ed690849958535e81b097a958cf05a8fd2a5946c565e958955973757bad594
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16432 bytes
SHA-256: dde4af35fdd4fded0259bc32e64a109952f0881ec60065e69d3d9aac106c5a39
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1