Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acac42a5d27af60…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 06:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 545f1e54d91b1e339fd0d07cbc796d8e SHA-1: c751dbcd19da46263dab1f29098bc551b1857e9c SHA-256: 0acac42a5d27af60519288e7a64c9f08b4615b89d78be1f9267d529953cf8691
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://hillcrestneighborhoods.com/userimages/95899853139.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/mugusatomibegobesoki.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c273285e6---sogokixatugegimagotifes.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zobagi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/furogogabejumema.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/10725146240.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunipovebel.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/52123824361.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84828482944.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/50569357796.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ca437bcb---nubusonob.pdfIn PDF document text
    • https://jensbrode.de/files/file/rijenot.pdfIn PDF document text
    • http://opsir.eu/files/file/34992172476.pdfIn PDF document text
    • http://vuason.vn/upload/files/mefosibisuzodusepanaguza.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/32711608847.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wuvowinozugize.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b12985a53---raxugudamux.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vezedorejajuvamuno.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/40147190984.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xanokuxomex.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/70857743748.pdfIn PDF document text
    • https://bagstyle.uz/images/file/lajalotosonivurabidex.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf69cbea9---nevituv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a9a98264---7945555925.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/gojefikitom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=calendar+alarm+app+androidPDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10316 bytes
SHA-256: fc4e451750624db5a1c8855fe72909ce39ceb6d93198ea484c8534a9305dfb6e
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 17392 bytes
SHA-256: a8fe4824fe186bcdb74ce0c1ba6c65e69ea9048e5ed8be1088e1d38b2d12e1d1

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