Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4bdf05a9fd47b5…

MALICIOUS

PDF

90.2 KB Created: 2021-08-10 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a575848f041333dd1c9202322e654b51 SHA-1: 866933b278a5cefeb1c1cb6adf89879b1289d82d SHA-256: 8d4bdf05a9fd47b58463c951656b3b6a4ef62d8418edecbb9cabe7ae16831598
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 contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm. These links likely lead to phishing sites or malware downloads, aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d5134893ae161e849dd77f19e78aa49b/gapuj.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210626_B4D1E10549C229B2.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tobobumevelosizi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vjq0593uagnc91qqungtsofktt/pewogezevugid.pdfIn PDF document text
    • http://livestocktool.com/d/files/zofowipozuzofa.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/33606505990.pdfIn PDF document text
    • http://www.heksan.com.pl/file/3008275488.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/97470678942.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc19156b---63221177384.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104f1ba6a382---zurad.pdfIn PDF document text
    • https://cristalensi.com/public/File/bizomagadixubozetarazudes.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xanetopopevejuzize.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nebl67cv3nc3likq919of6jdgi/gosopiliv.pdfIn PDF document text
    • https://argumentua.com/i/file/23691069641.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/molivufodasipe.pdfIn PDF document text
    • http://fkhd.cz/data/img/vipes.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/revibefubewakoxegojikiv.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/59915071654.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/17587839159.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/genixiralinalinenofififi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/71aec2385b8168001908f3c1c5fa1e78/xelakerevuvonifede.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/62569472064.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b076ef13a35---nipizevu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/68c643babd1927201f70c566aa42adc3/fisolexizumavuzigigovij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mkv+bollywood+movie+download+2020PDF link annotation
    • 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_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10776 bytes
SHA-256: 20fe9087c5e927925c462b0637582db76e638de41f2171b5cb1d827edd87f83e
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16868 bytes
SHA-256: 40c35d981217fe08ebc630d6f4e35fd3f0d4954b42ad9f4de454565e3b030212
font_02_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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