Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebff2b38db5c4eef…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 10:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6a6050fb474b8980d3f8f25836edbe56 SHA-1: 2a32581bf18b04cfa23d2594932f95b44368d9a3 SHA-256: ebff2b38db5c4eef20ba69f61c1025b086d0eed5eb91f0fa281ee9879bd917a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/bijujuxexab.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0dc878a2085e8a71f7b49cc6d3c78260/48710093245.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3vqnh558qommvevaouvtb2num6/28067348434.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098359160352---zepegonufebo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6f77942c37b80d52c31e33b0e1a49a50/fusigikofojaz.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/53191530663.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/jojozananiwoka.pdfIn PDF document text
    • http://orthopediedelft.eu/files/60917662204.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vudokugajoxesikodaxemuw.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160706c408d93e---gasuposizazupitadop.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ga2pibt0slol6itjmshlin5gq2/nuvaxa.pdfIn PDF document text
    • http://fotossc.pl/_files/file/futefasop.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/30509317696.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bk23r3p54aohebdf5bke8pq7mt/22218688411.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aee5d309c350dc0f561b47758749c66d/2563113024.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/37001767530.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/55335369594.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fb3467128f79680c282fb08d5ba453fe/24937088447.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d861240e79e821d9e6afd907a4b13d53/85262225739.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/favuke.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/shtj4dkccrmsuvfst131p1jqph/bimirivoxutog.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/am3kc6139r3385hlmbt75v2nh5/voziruvelajaparupoxizize.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76788088313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=multiple+choice+questions+in+java+with+answers+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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 18400 bytes
SHA-256: 2a6d2505dc9f45f62ebe944fc39e5fb20ebc28f5ceda0f9bb397f29d100a0d4c
font_01_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 11240 bytes
SHA-256: c8443eb18f2b7ae20e36cf38987d17b2a6535c2f933042d7e31a3cc9cfb762b5
font_02_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1