Malicious PDF — malware analysis report

Static analysis result for SHA-256 3377389d9feadf58…

MALICIOUS

PDF

83.3 KB Created: 2021-08-03 14:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ab9779c01cf6507dd23991d185f8ec0 SHA-1: fc307a31f1971e4c528f3e478ba0dad05a20bc88 SHA-256: 3377389d9feadf58acd47f9a0207bc7c5e8384f8b39facaa9a63befc333ce9a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=solitaire+tripeaks+coins+generator+no+survey PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48720b2c70---bubumipunixanegoruwu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/bujopubuno.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/gutedipukijexuvusumemo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rtf9d2le7te8qfap3jmlj0tqtr/zejuxesunofavetunariv.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b38605e55c8d51aa030ef3bcd1d2ca37/99337304793.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0bd629c3---15949068323.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zatazesewenuweroz.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7ffa389ef0b223e63fe5cc6ca7fc22d4/34906783994.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d247898610e---wixepojolumozumeraro.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a7d2e4676825410761bb98960d036ff9/6883397380.pdfIn PDF document text
    • https://banghenails.com/upload/file/42329598306.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160805ea19cd40---41095214860.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vazesugovoko.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bogu1oogjs0hgm7dhk974ph593/zitubi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfaa3212---zimatosowotikate.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/69f9011da0f6465fa72429a6f06b6bc6/98219911233.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/27882743712.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/16803831799.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2qhh1dovnfoa6gh9qjedd7n918/4540326170.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/56852706598.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/xemefovudetefi.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/37964479486.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jijabeliwomexez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 16168 bytes
SHA-256: 9a5daa6c5d0aa3697c0f961f57b76fc1feffbe8783e99f87aaa7d40d560afd6e
font_01_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10996 bytes
SHA-256: 93f2b193d8a60272445f27cf5eea2fc00193247b994b63090a68f16a4df981f5
font_02_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 17124 bytes
SHA-256: 89ebea1f9a94cb2a4a4462a467ced16adb3111e86e1a9442e8490da528518c22
font_03_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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