Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a9cbf5734127bc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 05:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d577b0ea6cc5929031fcdf23a36c33c9 SHA-1: 499a27102c4c2b9b5125faef98279c6f117f9bb4 SHA-256: 78a9cbf5734127bc1813970cee8d325252c532a38c7839c99e4dd150632d4fdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The presence of embedded JavaScript, although not directly executable in this context, suggests potential for further malicious actions if the user were to interact with the document in a way that triggers script execution. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/lafitudulemuwiwi.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3c5aa8e7643f63f3ea7e57f2b178664d/44300568608.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/73946430177.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///kibaputuranare.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/i55980n67ra571oh8sg5oemfs3/63761595316.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kubamenezusoxuwulan.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6970e8d3b01842abaac7d3afe2ba6698/somipubifuvagowo.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/20368421684.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xofizikopajiliterilutakeb.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/99559756980.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/26463747085.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8rsdk4umjah8qobkvgghn75u24/67381982651.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3910da02a5---nemakatuvasedonusegusuzu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lunopezapos.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/niziwitotizef.pdfIn PDF document text
    • http://centrons.com/uploaded/file/6159636936112dbf1c3b50.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/a8daeslttubgqmjphautlfi8j3/datuma.pdfIn PDF document text
    • http://jawarakreasi.com/file/tafarolovezuzumow.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/gesawexibo.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/77664178016.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/26580175054.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nopalizelafixofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=essay+on+teachers+day+in+english+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.pdfIn 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://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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 17336 bytes
SHA-256: f4dec48a15e6abdd25782c348342988291ac75787253346a33c945615658fb9a
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 10996 bytes
SHA-256: 313d2b4a7b73b7dd1d5933d3daba4761e02835bfce13ab2fce92caaed14c5543

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