Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5f3ce39fa124c6…

MALICIOUS

PDF

186.7 KB Created: 2021-08-15 05:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10f70774ea803cec3d4624e8e5327906 SHA-1: 36e4f445ff83fdb50c9281023c1c246d14a75bff SHA-256: 8d5f3ce39fa124c612da36da48d1ee6020565cb2f41f8c3b038b1c063f65cf51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm patterns indicates an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://doanhnghiepvietnam.org/img_duhoc/files/51540355382.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077557e9c75e---fasus.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f9f0d41b747fd42c90a4ff821e4c2d2e/suzopagupefax.pdfIn PDF document text
    • https://reniuved.it/file/85292946612.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8cd4a5c949febb3417cf4c31af13044c/24738003403.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070eaf8e20df---54389726233.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/10026466585.pdfIn PDF document text
    • http://kiraat.org/resimler/files/34861761967.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/82038037816.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687091b607---93879204647.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e8d0c01d670ae9b8ac2e9d096be9aa7e/vuvixowujova.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/42985887089.pdfIn PDF document text
    • https://seerupit.dk/assens/file/fipogopizavaboloku.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7dec41b6---50895470864.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c3c6f56e5865894bd19641e61317db77/47232831428.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a90c7f3cf0352cce60c0e4ebf1ca5172/bukir.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/30661216495.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/jegoluduxunujabodefixu.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d5fb301f0d9a3bb82fde37a54511bc9/megudujef.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c93df14dc1c---xiwewumazumuretaj.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd526c19c9---77131638119.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/bapebudetemafudefoxov.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d92b0be3e---dezigekuxakupabaxezasog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=desmodur+n+75+ba+msds+etanolPDF 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_off00027a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A60 19296 bytes
SHA-256: df67472612298a13c759a08cb9d1e2d8b9e9a8b889a92cdcc1d67a0d4dfae53d
font_01_sfnt_off0002aba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABA9 10740 bytes
SHA-256: 6b6f21aaa2f7cb53bebb5e1f15c969bb8187827824b659391a5bfb6128fa1578
font_02_sfnt_off0002c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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