Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9b4590e09aa3f2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 23:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed591001a761257adbca6fe85a78d4e2 SHA-1: 497c80de0ad4977925c07141f8dab35864553002 SHA-256: 5d9b4590e09aa3f21441bf47a52e4916322798df7f5442959ac5fdba8c3efd1a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to PDF files hosted on domains that appear to be used for link farming or potentially compromised CMS uploads. The presence of multiple distinct hosts and a link farm structure suggests an attempt to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://zehanbiopharma.com/upload/files/webigipomot.pdf In PDF document text
    • https://fultoys.com/userfiles/66117571088.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/78906446645.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/debavolemevebolu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tilekawubifefivax.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/63341036759.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xotiwakevolivebof.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/ribowivexuwajedexavabuf.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/68634539095.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/dubakuzafaje.pdfIn PDF document text
    • http://suurelepa.ee/data/file/42877897718.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nogarujunenajimuzifon.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/75422747583.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/26830990997.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/bajovewaposededaz.pdfIn PDF document text
    • https://pr-dienst.ch/file/82169952858.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gigawajaxusuguxaje.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2f6d2178---nubimunipizogikiduzi.pdfIn PDF document text
    • http://leeandrewdavison.com/download/zujis.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wutifotomidaj.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67336328464.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4ebc28803b674364e720e3fc9c368b17/nuruwi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/91996350545.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/goxalode.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gusakibonizixitivijava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bollywood+movies+shadi+me+jarur+aanaPDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 10964 bytes
SHA-256: 19deed9623d87e63030d31b86297b6642476f8a1dd52051a4c48b67bebf1b7e0
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 17208 bytes
SHA-256: 8893cdd35e65908b4b84a25143a7c5d672869535a3d3c8563dad6ff5b6bc078f