Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0439eea062342f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffdc26ab4366a48dae1eb1db8fe8b357 SHA-1: 6fa0de77f65e949e21dcb6e3fb673cef22a92db3 SHA-256: 2c0439eea062342f7e58b7c04ad1f00ece562c728b5d705d378f22f1082ec719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on WordPress upload directories. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aimara-bg.com/userfiles/file/39668338566.pdf In PDF document text
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f361df7d---rogamadam.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/69155608101.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcd8ab847---29949097680.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/31060419495.pdfIn PDF document text
    • http://qdjshg.com/files/file/7101079567.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aa9eece6d---wijinakajag.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nf94aa4rait09rvu6er6enoorq/damobibikosolosararun.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ffb41292---67469927970.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/99910548524.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dc8c4eff4d7e95d6a6e36a4d9e138799/dajesadugegikebakalaku.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/73133538882.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/85977320851.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9ac23c3e99f200afbf1a095f86ec3be9/18273396075.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/najegaguniribomejamime.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/kawikatul.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5692561667e0397d24ccf0aed04649e0/xabaruradikotodekujo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0137e2dd---77974112741.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e6b9a01a76e34c85ca2bb167ea221a1e/75262178597.pdfIn PDF document text
    • http://beijingteye.com/upload/files/ladonimowumasaloluluk.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9f0ab79208118e54b73d403b77e049f4/33465240806.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105df9e11655---57117477320.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612858790016f---furake.pdfIn PDF document text
    • http://deltools.com/userfiles/file/boxexakeje.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/25874405272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=missouri+vehicle+bill+of+sale+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 17364 bytes
SHA-256: 0f8f10752f7cc204c2f653e9cf67e55eb85ea046d99a9f6a859f26b83013e41e
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 10816 bytes
SHA-256: ae7d48338b357abe48d0ab493a5471e2d6a7ce2adff7dbdd37ebea90a5ef3586
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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