Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebbf51bd128ee63…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 09:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0455ec913de03d9ad7fc5f8ef0730458 SHA-1: efe5ffb26f603eb65e01782a45b1f7e59ebad513 SHA-256: 6ebbf51bd128ee63e5a9ea912ee7709f93f042e8545a6ad95121e6282ac37c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into clicking on deceptive links. The presence of external URIs and link farm heuristics suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=radiation+therapy+study+guide+pdf PDF link annotation
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/22969105e967d531f604b2e4cf164125/watulikirufetesapunaze.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/kekukik.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dd3f328c4fdc0f21af19e16b80d441ec/rabanopobatubujunezumera.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/jibojukevazagadexatuli.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/lonekedoforanigop.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf695a40efe4220eea964de6ddf615fb/tolixewudoxo.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/23d03cdc09af36b426c4a1f4f319b59d/47764329203.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/19736290008.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9f2f9a5a720d68967fedd52b1a78c418/52265808079.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/41612560427.pdfIn PDF document text
    • https://afayl.com/userfiles/file/lafufujokebidunutakidaj.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/83803107461.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87af777711---39560388317.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5bcef1b5---pebapizinosebofewemaso.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pipagatiwusamud.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mawoxepoluvamidulijab.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/nineluzufuxopu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/zilelironovuzurofewelen.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gopanuzapomo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/blojh4od8lh6i8v2rv5ela71co/vugetu.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/31841947870.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa867bcce---7889422259.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_off0000bdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEE 15840 bytes
SHA-256: 5ad21afd572dfce7d04201b1d1cc7af8156641b6dd64fe6dd463054bee29f6c0
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10992 bytes
SHA-256: a27e769d011e526f08dfcb02909fb44db6162690999d9b84b6f2650c885b983c
font_02_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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