Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cdb801befa879b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 23:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88a09a3aa71ae9a592cad36a7fa9fe88 SHA-1: 3023a3ba7da7893d4972bbb2729b2f310bdbf5b7 SHA-256: 90cdb801befa879b7091e1321be06ecc29215e032b3c6bcc2bbc5b24fda82689
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to lure users into downloading further malicious content or falling victim to phishing schemes. The 'utm_term=download ebook harry potter pdf' in one URL suggests a lure to entice users.

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://conexus-study-abroad-travel.com/ckfinder/userfiles/file/25611075256.pdf In PDF document text
    • https://mihalex.by/files/files/dizuziladubekiwavurite.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfa56375e---27025624049.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613db662a55b2---jopegekafo.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/65778847753.pdfIn PDF document text
    • http://armanetti.com/images/82981326501.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gawamonanezujuda.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dujudesobupaxuxit.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/594381df2f47d585f7e7e4b57556b422/83067009031.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///21141059080.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/jabadize.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lesawagasuziruv.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/66373006369.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zoxibinepunulit.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/90887022316.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/velagila.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/92596500952.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/36322896652.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ee31c9ec2ee8214cf2b9ad07cffe9415/fadek.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/33437971038.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sezonavuvus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+ebook+harry+potter+pdfPDF 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 17248 bytes
SHA-256: 7bec943d35308e62ed86ac08fb469b9c7fe399fc3544302f8f295a4966d1a8ab
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10768 bytes
SHA-256: f9af4581aff6f0329cc450eefae979363263113f8d29bc2d795db901f0b35cda