Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffffd88ed90dfbda…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 06:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d21981e11bd8ef8c6c0920beadd49f4 SHA-1: 64304f1dddb4f68b4a29f55a05a85c8824382789 SHA-256: ffffd88ed90dfbda5ab325038c30a0740eb0067a3269a76723eede1b823d3693
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document's structure and the nature of the URLs indicate a link farm used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nhakhoaanphuoc.vn/uploads/files/resalebemebun.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/20753035289.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79934dcb30dfd119efe8e6f99861efde/jonowilevemuji.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/71011462122.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ltsc8oju17qus2f30j256vlai5/38403388393.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/204706684460edf29d4e4f7.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2db34b2f6570abf56fba3940c541cc08/vimet.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/74611340996.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/28872169247.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tevufotupasugipibuvod.pdfIn PDF document text
    • https://esz.jp/img/editor/files/51401515554.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/tibidanaxeduporamaf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55240c5b9a---xigepasoteresowini.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bfa5398e---fagukomoma.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/61037631248.pdfIn PDF document text
    • https://lesura.net/userfiles/file/36069175464.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/31145027739.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/16e6v7j9vp1j53bufqpu3dl5mj/36700364515.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zupotovumi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b33f1rqsbuchpdkfk6fajke4jl/4348930273.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/zokimewupivinedasite.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/lodizejetebogozar.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/28577646791.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/90699174429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sum+and+difference+of+cubes+worksheet+algebra+2PDF 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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 18020 bytes
SHA-256: 740275fc0a16798e238bd6d3314b9498ee05a0c8e1cd9c980629bccab1c5cf8e
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 11536 bytes
SHA-256: 61ef6500325c6de0fa34a338b3f95f25eee699413b0d07ca06d58c55ab664c0c

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