Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed164d58d3dac5d8…

MALICIOUS

PDF

82.2 KB Created: 2021-07-02 18:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90befa4bae6f31fd8857110efcdccd94 SHA-1: 745fac79dbafc047c19a73c2d8cd3aadc1022d97 SHA-256: ed164d58d3dac5d8dac58a7c17de28b6df04be642252c2011c12bffbcf824ef1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely serves as a delivery mechanism, directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d9bc58441415807f0f2ba0f4e1cd57d4/xegebowurev.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2jl4dccdap45c1p0mvlookfu4r/70808581981.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/88597621686.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kusalesevotexo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/npbhu5fenc45g2sjqgue2shhp6/falaboka.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9fa2656ad65e7536df60710ddd2bb626/nenixaxi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b57bcab4d867bb86834e72386c458592/kojofowedov.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90486c452c---36938467997.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d4009ce702b---mazubavew.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f8826b836cc45e43c4a44e1cd2aa464/jafume.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3ea63a41---dezebik.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sukobodosibelamomep.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5eb846be---puxewaridob.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8a971e2a---renixizilokukijurujokifav.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/58502366912.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/79059901511.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083040bb1799---meveteralidejodadem.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0f7e67ef---xivobobilukiwa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a324f7f4---94142888173.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b91d33ae9---80282059837.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kokedetalodusejiwepikijax.pdfIn PDF document text
    • https://biocoils.com/img/file/temowofigafiwoten.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/18026874034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=future+lay+up+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_01_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 17612 bytes
SHA-256: 4ec471a638de984d8e6b9ca885d060212ced11acd608e063f7cf2c72dbd91f45
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 10740 bytes
SHA-256: 00060eb7fae8cb9a06c0144bd083dd1bcdcb0046da39c1a1dc13657c3041cc70

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