Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4966d228893528…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 07:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14444cdb01b167dbfa3c922af13acec1 SHA-1: b181c7baf6d111fbbdc6b01604513443a391db85 SHA-256: fc4966d22889352806a10b86cd4c79a889a9bb827fae47908ca0877d58283b11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://droprint.my/home/ququ4923/public_html/userfiles/file/rotadunizidopalalosew.pdf In PDF document text
    • https://art-lamps-rali.eu/files/file/99251384819.pdfIn PDF document text
    • https://doitoutdoorz.com/file/bEPlhhYHZdfZbmF1.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c2d4e3141---pizexuxifegugosobarasalox.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/77522067321.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/77201093054.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105160105.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kutovevufekudef.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f538db51---lidutogewoxevube.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba3e21ff4---4298860038.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jefuxufoj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb224b518c---22727565939.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/11943933396.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/54519762197.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_220724.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zagexuwiz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8998ab9dfb---gisukakarujowixuba.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/34848674324.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-27/20210827011837220908.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ee5aa4f7667ea3aeb63038b8b70eeda6/30453575590.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/93976145496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ark+crystal+isles+resource+mapPDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10716 bytes
SHA-256: 4d9680415e19e8f1e1dab68c9703e6b693b086cf50c81fdab4be1436a64a29e9
font_02_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16896 bytes
SHA-256: bdcf0e060b738770d27ec8a36b31609079658914488d47f53d6615ba8d167945

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