Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4027036fc127dbd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 10:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be52edb79cf63f9d505332ae345d28bd SHA-1: dc1ea8dbec960d8fdab7bdc811bb7f5129b83dec SHA-256: d4027036fc127dbd3b6f3e9bfb86167ca06a71c039b5b42550e14f72f5be3912
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent beyond the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=kissasian+high+quality PDF link annotation
    • https://takarasushimn.com/userfiles/files/zonovolomokezimifumap.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nudazafovebiruxugone.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wufurapivuketunowexidur.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090506153573499.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/wabajuludipa.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/zobosazijujivepikedof.pdfIn PDF document text
    • https://heureka-cz.eu/files/nekowefudaxus.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051549469917.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b9ceaad63b8c028fa72ed60ad02b82f1/12260826923.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63990702647.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/tifumajev.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145623873055---xaponutulurax.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ladevijotofuwilaxu.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/fepowexukitexewile.pdfIn PDF document text
    • https://birudongker.com/contents/files/2121926796.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/53694020037.pdfIn PDF document text
    • http://manu-transport.com/documents/file/42102385968.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161382e7de806a---60197664150.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pt1cudkqb2e1c2t0pah37jfjnf/9342389284.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161402c85a04af---91747150733.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/gogumofanobofamip.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wewuze.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nupum.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6aa6307---84713499738.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/11230036570.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zanonebifitim.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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 17652 bytes
SHA-256: 9326c72d927792476c3a06c1435139e77d5d96b2de8b78fcdbc871bd038c56ba
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10388 bytes
SHA-256: 7cb6f0c9acc3a8d0892304f54d28a0f087aec7bf6e6a8973ebe8eae5dbf1c26d
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1