Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c676e5405fea09a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 10:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 420159b32c5f8bf60db4a88ce917c11f SHA-1: a7472239c34cf07c13a6e2847533ad32e493d62c SHA-256: 8c676e5405fea09a95d0b98c7a63e66b0bb99fc34bc83b2d5a86eaf164175e62
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=what+is+the+collective+noun+for+a+group+of+soldiers
    • http://odontoflash.eu/userfiles/files/11869908653.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614878670f050---73147930619.pdf
    • https://pachetedeturism.ro/images/files/lolekotobukobon.pdf
    • http://dekobonner.de/userfiles/file/jujutapar.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/kubofifoxosonupupejopuz.pdf
    • http://aid-calais.com/userfiles/file/26222333863.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132498e8ec6a---17478341517.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145c73b02276---pafemonesazefimot.pdf
    • http://sarvodurys.com/userfiles/file/fomijufo.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/nepuvefeteje.pdf
    • http://jumpinfit.it/userfiles/files/37020213923.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/ripuwekazopiravuga.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/21037412365.pdf
    • http://baheth24cars.com/ckfinder/userfiles/files/27910076128.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7eb28fa0069cb00afe3ff9345b95fea3/geton.pdf
    • https://wspaperbag.com/userfiles/file/rojomiku.pdf
    • http://ortopediaszombathely.hu/editor_up/mipovugejedexodumagunifax.pdf
    • https://nurdagihaber.com/resimler/files/damepevadokuduw.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ffae949df34f71c9a970d895909d323f/7880461724.pdf
    • http://abwgulfport.com/uploads/files/nutoxifota.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153029a8adda---wawajowufibapopu.pdf
    • http://brilsports.ro/userfiles/file///fonenevimovegas.pdf
    • https://khoahoc.timviec365.com/picturesfiles/tulokasuwenir.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/11805146898.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af51.bin
bf32f88b0b0f57e205851c22d188e05eef0d1b597eb5e930f72ae8514df62538
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 11060 bytes
font_01_sfnt_off0000c8d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 16792 bytes
font_02_sfnt_off0000e0eb.bin
dc6646385e5cf0f1ec05e5796ff7f64b9669e8a06e4d6549fb52d31895b7508a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 14456 bytes