Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41936ad84d86daa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21b635b9183596503ad5cb7a54c79aad SHA-1: c9d7a16ad423e91a7be1cbda541713066c6ac13c SHA-256: e41936ad84d86daa03f088fb277e9dc613e78e714a3ba3777a805019ccb7e8ac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs lures such as download buttons and QR codes, directing users to external links, some of which are hosted on compromised CMS uploads or disposable hosting. These links are designed to trick users into downloading further malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a17e6c021f6743cf91ed812c5a271397/42157042208.pdf In PDF document text
    • https://ecpa.fr/uploaded/file/26819476122.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/buxami.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zidagezeraxilobujonozeviw.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vowemofef.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/ziguwetesukixemapano.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbddda6d58---38849082751.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/30360e2e837a5ebc80b9a643bda3cd41/41196630077.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fewifufimowexugigadumenag.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/voxuvanuz.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/bozogeratisoxapuduw.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pararuwelosowofasod.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/79382008059.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ae4e4337fc94d92a5e43e24ee46c180a/48092304233.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/rujomusukemakijedege.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagelopuzuwebidarit.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/42620244570.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/65018569050.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ah1uidgmdktka9kcvogbia78it/62806336609.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagelago.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613834dad7652---palimidenaletikazuk.pdfIn PDF document text
    • http://tcihk.com/userfiles/xajuwaroxuse.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/femenexutapikigoba.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109101206052522.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53c13a81e---60855684873.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33944369227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+it+chapter+1+full+moviePDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 17692 bytes
SHA-256: 5f3e7a41cf1b32858f1e05485f24c4ead9c5b5b74caa5d44bcffeba97f87fa65
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 11020 bytes
SHA-256: aa49d1c3e47fdf51d2343f0c918c89cf61095caf7d99cc4e4a5af765bd1e00d2
font_02_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1