Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36bb1bd8b0c7b78…

MALICIOUS

PDF

90.2 KB Created: 2021-08-03 20:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 002102bee2ac5e45cd9db825d84c3370 SHA-1: 679c5f3ddc1545e158a1a91f580a137d69a1c204 SHA-256: e36bb1bd8b0c7b78ccc40b495731ca9ce6befb399c20ad0ae976334ee6e45d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2ov4618e95kng4pef1mrbvum08/dofekixasarapunoluvala.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e9e78d178b9f5579bf7b4d5b060e88ef/21980633649.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xesubinelegifomadava.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4a8a55f3---gozapidivovupivade.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/46234929637.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210720080615.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1faef092---61154397549.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/mosixodujavekono.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc36658a7---dasepig.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/75650766360.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d11e79c15---latoruretekutuvukozunabot.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/kewaruwagel.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210609015529291.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xudup.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/facd580a8c14827f9f48397353420655/57229193518.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6f0e875e29a4f39dd9d9660026dcd16c/vukuzumagi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c3f4806037f11bb1a424660534670017/75560588221.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c307ca41---mugorenegemetabirume.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/geloselebebixegafukesesu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/widirevupolemo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15586999068.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f41a762a4---zefubonutimaravabebojuti.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/duzizegometibuneraxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+de+calculo+mental+para+cuarto+de+primaria+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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 19092 bytes
SHA-256: 81ba49f2809351dfe2813c182ad53b8ec502d2cd27bee0784e5dc7f92caf89de
font_01_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 10992 bytes
SHA-256: 269d6d3d04d01894094aafc175fe775264e195dff805bc6938264d37720ace8c
font_02_sfnt_off00014133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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