Malicious PDF — malware analysis report

Static analysis result for SHA-256 f012a4b1284ee169…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 18:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9896c166d19397d5e1a6f4c432b5b910 SHA-1: 5c988223a61b3264387743ba6c05174f8182f6d0 SHA-256: f012a4b1284ee1699ff104fe8f48e62be3c1fe6332e56399cae4cb371ac79ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various websites, some of which appear to be compromised WordPress installations, with the apparent goal of directing users to download a mobile application. No scripts were extracted, but the presence of numerous embedded URLs suggests a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://paraglider24.de/pics/fotos/1/file/riwipevipefibur.pdf In PDF document text
    • https://hometutorsdelhi.com/userfiles/files/zebimowopubedidunipele.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/25443700525.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/55199137351.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/76343675935.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40560895775.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469045671d2---laxowopidilalakod.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/111517094943.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/81104702098.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/nodiwerokesosib.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/662407512.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/99193040471.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/pezedemovutalozelimeva.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76b8671a4---sigixegaruzudezugu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/27770636385.pdfIn PDF document text
    • http://asvpp.fr/pdf/jubuzutejelazidekelu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f8d1b0d0---22514302761.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/xejekox.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/soxafofolixepukalulabojo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6641efa1---zumof.pdfIn PDF document text
    • https://qkon.ca/images/file/12085509625.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gopuwarogosisap.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/36314733766.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/42807688986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+classroom+app+download+for+pcPDF 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 18568 bytes
SHA-256: a22ca30f4543d759baeb36b2026d12419dede92ca6fb465fc6b0f45e600f2b89
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 10904 bytes
SHA-256: 3e5b139ca9f9bfafd07b1573434a65d577e73c0b033ccff2c3959ad3391afc6f

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