Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73ec5ac15e67840…

MALICIOUS

PDF

90.1 KB Created: 2021-09-06 08:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2f7045ebb4603950ae54708de786841b SHA-1: 8189bf02d969611356b95792fb0e692fbf36b466 SHA-256: d73ec5ac15e678407248f8bf6bdbb0a07deb589890073fb29162ec84a69ef906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kabojuratakosanuw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4682111e5---81187315605.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/06c574a3759a736560c0e4d7ae6e904e/67418214425.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94bf85cfc---sanagofonekizi.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/wizobakefe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b32d20ed---26266229905.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/mogujafokixod.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/kodive.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/zopidiguwafemiponujewoj.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/mobajitapanubaroxuvasovu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7832a5e8d2---20860871478.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xamuwivedaxudanebino.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2efqk02hprs8tqo43baikgrjfr/11977433005.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/nawofanawogefibagu.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/nugotogomulud.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cb5e16e559cf29a9914d259c777981ec/rabaxinomixax.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2217347543871250be2fb19735dbeb37/mifove.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/54261591843.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a1532ce6872de94d2f2e611445329aa3/89114889274.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c117437fd5e5cada3dd0f3045993e675/xejatowebe.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/juzalanepufaxafizap.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1aac02dd0---doxexinedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lakshmi+devi+stotram+telugu+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 25152 bytes
SHA-256: a410f412af0dd1c6cae28a2e183ff326b76316e99ff6d0e34b4a2ef1ad97362a
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16980 bytes
SHA-256: 9ed84ae60dc5b4b320fd92a2861addea9b738621a2e6f7726507cffb106bd9c1
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 11056 bytes
SHA-256: 87a89b01b97a50bdfd4b31a9619cce576e87aa79a149ac8e3d55e0c74851e81a
font_03_sfnt_off00013907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_04_sfnt_off000141be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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