Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c21c5e315f81f0…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 04:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cfc5aea27219d5e427f6a865e844f23d SHA-1: 0ee6f7e4e815d6d092391d981aa6a2b1cc0da6d4 SHA-256: c6c21c5e315f81f01438d041d03086a9fec5d81aca517ea2b808eb0addd7c5de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=best+sweet+selfie+app+download PDF link annotation
    • http://xn--oy2b9bv81anouola.com/upload/file/202109020337574896.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/da24da552e55e7d626fd1a3700b78fb5/96101732719.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/mujomokapuj.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gezukoragune.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a9fbc4f9489f7ce243ff6697a2702ca3/5448659560.pdfIn PDF document text
    • http://imi.vc/upload/files/xexirivixaluperovel.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/33226325331.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///76553968299.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b49601593cddf2351a8d535e185d3c1f/28703961939.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/60968058942.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d2ccf3b8a---78174606982.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/megovezekamekuvaniwikaj.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/72005714306.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903225327717.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/57153197862.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20211001_3D9BF9404849EED9.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kdj03jc6j3k0jq2kupnrabcsi4/niwibijijar.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/jusavow.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/wetofomubi.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/najovu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nufotabuxenipozameropu.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_off0000adec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEC 10528 bytes
SHA-256: 97b8b0623ae1c5de6e449a6f649f7dfab06b1b732bc0565aaa2375ef4ff73b0d
font_01_sfnt_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 16932 bytes
SHA-256: 1f96bc2b01f2b925fd639084d3c38f908a3177ed86a6605eded7633092d8068d
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1