Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93b9ebfb275f297…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 11:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d77afad55660eb281931b945b5873b73 SHA-1: 144524a80a505f109944abeb9bdf7a6fea7946b6 SHA-256: b93b9ebfb275f297dd518bdb680acec8999f2d2252a3ca51b463fe17b714b217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware distribution.

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://laborke.ru/uplcv?utm_term=how+to+speak+with+a+german+accent PDF link annotation
    • http://locum-system.pl/userfiles/file/41238686793.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b686d84183efe628c1efcaf87b9ba32/luziwi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8fd56be---sokebodefawutexiri.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14701ae67---xirokazagixelatopusezobas.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/17532965970.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemetexozumunazujoxoxabim.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/govekexo.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/22573361079.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdfIn PDF document text
    • http://risme.vn/files/vebewetimadulibuv.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14831772582.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/46400238900.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/tuzagexixuvese.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/95246598967.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7941cded307627cc5707c46a41dafd81/zetirejovezolevivamej.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/napefonovu.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/54931722440.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210912142530499.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914030211.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/36187958990.pdfIn PDF document text
    • https://stormester.no/files/file/15428428773.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/xikopokuxirosozajuwu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/revepokimotikegigisu.pdfIn PDF document text
    • 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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 10944 bytes
SHA-256: 076731767697f9e22611f7a7c5f83420473220ba501e89120e230f1bbedb8414
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 19076 bytes
SHA-256: 7f1cac9d185a360963095fdb7321d49cf7d3b77a7c18d1918c0f018b4fa7e1ee

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