Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f1ff79a041b9a8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d8fdb5cf6b731349c5749edfadea154 SHA-1: 532295aa8f7af89880c3956685094ebfb990bdbb SHA-256: 40f1ff79a041b9a805ec05490b5f00054f94d61c509a60c6e258e07aa7f07b92
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sunarchegypt.com/userfiles/file/60521463271.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v7bij9g6altc5fce10ru7p761e/34464843020.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/pesedafupebiliduxaxa.pdfIn PDF document text
    • https://people11people.gr/uploads/File/83087980222.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/moseximiteweteresesu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jje1e8e9m3p16qavh92nr1r9t5/karabininosixuret.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3f49a715---73827959641.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f1f08943969101b5398f252b04b1e949/nezomevawaxazafa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/76f49615bf9019c12ddbc84ae5fcf259/kivubutag.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3a63cf26e---dezemovin.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fevovol.pdfIn PDF document text
    • http://hidramaco.com/files/files/zekepo.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/donililedijibapuwamebofi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/genegovas.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nilodisedapi.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/15689909911.pdfIn PDF document text
    • https://tl-systems.hu/files/files/domepiveridaji.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdf4300fb---90845286061.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/barefelafati.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/70140981432.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/78567772648.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-25/20210625071519911085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=anemia+report+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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16436 bytes
SHA-256: ef66616d4d40d6dbdd728df3a22b3a0fda2687fc911b98fabd26115e5793efe0
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10428 bytes
SHA-256: f6fdb579d685c693b9b69e5666ee908a1f70404a79f91fa963a543373388c0cb
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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