Malicious PDF — malware analysis report

Static analysis result for SHA-256 d852fe87064e0653…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 00:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b1c692008bc235d6853c87cf43af6267 SHA-1: 7c5eefb455cca4e735306f55b9d42292424494f4 SHA-256: d852fe87064e0653891855dba0d6c7a820e1435c38f6c36872008aeb6ea282fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely intended to host phishing content. The presence of external URIs and link farms indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=monte+carlo+ceiling+fans+manual PDF link annotation
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/dojubebujurenumemosip.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/tekakok.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/82523922516.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39948752031.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/53825641491.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/92712870849.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5010779621.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/82095243776.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8f6a1fb3---74747450157.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/zewewa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076574f2c645---82357113108.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607331c680159---32100747265.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gedugipuduviwumumum.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/vidokamu.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/pabewixijavejufugidokaxaj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128aebca3ddd---dagepoluposolukufajejaj.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/xalag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2411c87cf00953da348d3debcaae342a/vulujomizonudem.pdfIn PDF document text
    • http://nicosiacaffe.it/file/30252423753.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kijoxisoni.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9dc666f7442862f313b2589a8be05c53/sovozunikavug.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/70693473535.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/5127908504.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c74d62ca---lezis.pdfIn PDF document text
    • http://www.heksan.com.pl/file/51600266603.pdfIn PDF document text
    • https://morabia.fi/images/file/7517814069.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/71761164692.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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10772 bytes
SHA-256: 365d8363c0ab61854be362e0e5a98aa93efc5414922aaa822e1343101ae2d33d
font_02_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16416 bytes
SHA-256: 07beb311682ac375a1aa0535a7bc7b510c5ff3068507610f8e2056392103a379

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