Malicious PDF — malware analysis report

Static analysis result for SHA-256 016ea40c994c21cf…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 16:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58d141f9319d7881052544a58587c574 SHA-1: a54cd91f5d0f5205098569636083040ecd480a0e SHA-256: 016ea40c994c21cf7ed1e48892c4e05327a29f92d6981f78daac0518b0d9129d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akemi.ro/hirek/file/bulixureg.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kujilozasejubopeziba.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f91bfcc8cc---zafili.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/rebenabugo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xurogudojeke.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cf639d623e85157755365a1eece3b60/lugalubutir.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/sojusisagurawujeboduji.pdfIn PDF document text
    • http://hanleyresources.com/images/63737073492.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/dujekudojak.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631790806666185339.pdfIn PDF document text
    • http://drtamerturan.com/file/63074607717.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28af53511d90ba956c9632d20f9905e0/7573033451.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/guvubeliwuzajosisudagop.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2hdbrhubhs79o3kqp9tgi1fs26/70843775046.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/tojokimenofaje.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pnkrlbggg7fhne10puu5nq77t2/23287257177.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93b37dc28---69429213019.pdfIn PDF document text
    • http://kim-clark.ru/files/file/padipunakejudazuraf.pdfIn PDF document text
    • http://www.bash.cl/media/file/24021754012.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lijuwob.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zupup.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/mumivuxiv.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/2603885207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+god+of+small+things+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 17568 bytes
SHA-256: f68bd684362b383a5cdd7cc86ca98174f6e411bbd9ac31af0986f9a50f41bf45
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 10896 bytes
SHA-256: 622875522299d6a8eb9459afe40853d126e08baa9bed609c030b69d8a4858c49
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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