Malicious PDF — malware analysis report

Static analysis result for SHA-256 736ec36444c2c1ab…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 08:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d58b2beb1d3490d6300f64019a2aa615 SHA-1: 8d72a71ec269e6a11d070951e8b940748c8ba6b4 SHA-256: 736ec36444c2c1ab984ff101eed4e069ba00e5d34482e32c50deaa271871789a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous links pointing to compromised WordPress upload storage and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious 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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83623a9f7---79893088448.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/vejimolatiwufunobi.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/13922828654.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupetukeb.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b32c0e6aa---26130509613.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b7757c16---dowovat.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d116a3d14---kijowafo.pdfIn PDF document text
    • http://brenderup.ro/mm/file/jexole.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/nutulovolopadugus.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/fumutagafemajonub.pdfIn PDF document text
    • https://parfumzone.ro/files/file/78954155607.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612917c901aca---35386845595.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/41108136447.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051919125130.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/kotanalixuwidufuxapala.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b27160d45---92774214146.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/texalavina.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/22477885879.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/wafuta.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dd080bc41fba11bdd52d090068096a3d/pozifutitoruxi.pdfIn PDF document text
    • http://hanauhrova.cz/files/kuweguperavasegamozes.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/80952673123.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/vavaxarenepeliwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=management+duties+levels+and+functions+worksheet+answersPDF link annotation
    • 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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 15440 bytes
SHA-256: c191ee0dc478816c075fb18eac34f2ecfd84df90c973e3bbf89925d3acea4969
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 11260 bytes
SHA-256: 505c2bb8ca5e8f85abade7c296765b01eacd5c9de13f9da05f421cab8569885c
font_02_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.