Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdc1f4fba9e9458…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 01:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88d18771b2953ba4bd0644d5d3e5aacd SHA-1: 3e68d3569091e5dbb420e434696c95c53f550406 SHA-256: 4fdc1f4fba9e9458bda834303f3585f8eb36f2c321d82397aefd8ebc75ce87e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

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 https://allytemp.ru/uplcv?utm_term=logic+pro+x+manual+crossfade PDF link annotation
    • https://dancleland.com/img/upload/file/sepavavulonev.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/webaxetaxezepi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ffa158be---somobapupip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b613e98a0---sokufevoniloniwegefil.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/92765eddb4332341bc6f16b43318f99e/buxekekogudelurexulo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/65754799110.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/nawokitejifuxobanawebifen.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9c8b6daf---zilatimanutuvowugagaxude.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6e412781---narerasogimidanumivufajo.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wijeso.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/15754568146.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/19587397457.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kavipivumirumobarixeme.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/33b07006cbd3f8042f6333825101a1b9/ponanezagumiripofefop.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/27385669452.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/xewiwamotozidozafuxemu.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e23c230ba88543f14e58737ee8519cdf/notesarenin.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/wumenabuxoninelum.pdfIn PDF document text
    • https://subarini.ro/mm/file/90208415997.pdfIn PDF document text
    • https://x-software.cz/data/file/gagopesudox.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430030158176607.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/livajerejekorarejuba.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190ebeb7db2---rivugebaxojapere.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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 11024 bytes
SHA-256: 1cabf45a92ba3e590103d5bbd7ecf843ada04fe5d2ab5708106249af154f0c7b
font_02_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 14980 bytes
SHA-256: 527c444fe76af382a734e7be8f5bfffed0a2a0352088f696eff95b81f02bb76f