Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e389d807411352…

MALICIOUS

PDF

84.4 KB Created: 2021-06-15 19:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f38adfcb1406f59ee96c770b4b2fc109 SHA-1: df3b38a526c7e3aef867acb1fb8586116b0151f3 SHA-256: d9e389d807411352744a2080036f3ac750c62653c452e10ffdb99a6d2e152203
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=cute+baby+girl+pic+for+profile PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/kanefuzulezumitubenag.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860c11c6b0---18995539927.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e13e8a577---fexofafidogumixag.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a5e05579---37628012892.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vavefibubusipobodenesuvij.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/165040cceb3785bcf1b18f40e3e2c04f/60633511709.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a825c64---pizovuxozemomuna.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5c0a07515c09fe5e1ecd278defff3a08/17608226503.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcfc0f5fa---29815357809.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/09d7038bd145837c980bd4a86763b64e/80630302642.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18c44020b---64377505417.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823c10e5a8---genarolomotekamot.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/48497845003.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/5930604846.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/65882364100.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/74636880609.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/datovexaxigogakifudixek.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pipotazixirapuxolov.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ecdhf3vpg8qrtnuakqn4ofj5hm/45478185789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 5152 bytes
SHA-256: d4947c2cef322e9bc02d50b1e5c71061af2516f23fbac8f7139de2365b9d87de
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 10676 bytes
SHA-256: dffd2bf82a8574bb9d08c5262c8ded176614093694a2295f45c59f26b3e5c523
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16128 bytes
SHA-256: 87858e0160fdc663af7362e2c123a932a30bf342626b15f8f4c0a2a4d0f5d7ce

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