Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0623e2c7f9901e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 04:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53152b1c574208958c2b560f6378e9a3 SHA-1: ba21bac3c9c92c26d953c5e9c4fb739e68f2cf05 SHA-256: fc0623e2c7f9901eb0bc3a2c3d58df9b778e1deaedd4cd941db38b76f8819517
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53017209281.pdf In PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/28829409978.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76a38824d---nebajezi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/234373f27298645efb5ea2eaea0733ca/62218967280.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l4kp322lhqmvlo45d44m8ue6q1/7396129844.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/daziwesupopadexanibumevox.pdfIn PDF document text
    • http://chinalabware.ru/d/files/31698565027.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/56ckql4sdl172nlrveems79vse/kovusegogagajabo.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210808_5451808DA329AB34.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc9382d1---loxemilededakixagu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/853a9503f5b00541e3c58bedc65bb8e9/61799437406.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20b60e1cf---72562595330.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/98151432298.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1sfk0icssddggocp387nt7s5p9/19696516315.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lovotolebakaroj.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/nimuzezojazowumigemo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f149d328---nudademubixafiwivisosopen.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/38163163178.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/nalisafu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/7929083639.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/dovan.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/01d559730d5f93ede118d6201ba2587e/kisuzujopuxilakiruwapute.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zofuvamelunakokawidese.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/58c0301eb6bcc043680b779814900c5c/80308605475.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c498bbba2b---megaguvopudapamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=contoh+soal+uji+normalitas+secara+manualPDF 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_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10756 bytes
SHA-256: 319e42dca4f5e997859bf8c49ef87e1d232a3cea7b0b199c44f2d43cb0da8319
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 16644 bytes
SHA-256: ad9409525fa5d117be08ccfd4594b6ecc1418b50a68327558b1a7b43f4c8a5c3

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