Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5e77e1f6736f35…

MALICIOUS

PDF

95.0 KB Created: 2021-07-15 13:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d92a3a1053f253ccdd648904c9999cf SHA-1: 5f536ab3080abbff217ca96fa1efb1604eb7e1ec SHA-256: 6f5e77e1f6736f35919e6b7105b1540b64042446dac9884152259f2e5d7562db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress installations. The presence of these links suggests the PDF is designed to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://crysiq.ru/uplcv?utm_term=zanes+sex+chronicles+series PDF link annotation
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/76432981076.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d267bb99088---fuvimoguxomutosi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a16a743f---19669058052.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/08fb15ad4d7f255ede488d5283b2ec68/zubegugepimurowodu.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/5853172075.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/foreb.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/nuvutoke.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/76106778035.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/kosolabokivokebon.pdfIn PDF document text
    • http://gekon.net/userfiles/file/95065996180.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/jkl358mic4cfrqr0pu4s62o734/vinaxagotowejosozali.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c94cb473dcc2238d5fc33c387f89df28/fimomojojuwujawe.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/tixogimososotikefi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wazibawakubikexido.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15bad1faa---84053149518.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160babf44eb71b---gutaba.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/kivujokosuruv.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061601442680554.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/finotozotudoledabaxab.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3a3bd31b---63150663164.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160988827c2ea0---49204430705.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b343275c8---dakuberawepafidoloragipiw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd07e983d---teriridupalekene.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_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 18864 bytes
SHA-256: 78476abc56220a4198d90e725e64e62e26a383cf47ebf5a3094048100f79b41b
font_01_sfnt_off00013fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 10296 bytes
SHA-256: c5f96b1200de5d1483d54a3be25e3bd903862cecd499ad964e4586dc7ef73d56
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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