Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef3db9f0c92dea0…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be90f44cfdad7ec6c24c150319f99a35 SHA-1: f80b8134a450c6ca2fba70724aebef401a5f5c58 SHA-256: eef3db9f0c92dea041984eda7377c50d10a263c40dd6f5efdcc5caf11499f7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS platforms. The presence of numerous external URIs and the 'link farm' heuristic suggest a phishing or scamming operation designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=common+verbs+in+past PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9b829b7a1c8c39faff6affc2e58e13f2/65958819589.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210601225217601.pdfIn PDF document text
    • https://senfina.top/uploads/files/lunijunavuxidegomuwalib.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d13b272c3---vonepalugunen.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210628085552_95372118.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/18509492622.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ebbed47f3079105a4ddc96d29c6c6ad2/83260725255.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/8332066613.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8483e85402083927d4f243195d4c2a01/69978639080.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/turif.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/delifide.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4cbf2821478f53cb5727f086a5e7edf2/56912060224.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8db9256e79ed64a1c6796f287a5d72ac/7182470908.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zajulinukijodonomiripefax.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e02b70400a49601353f30d0dc645f5c1/dovapurerufefixejaman.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/48242124266.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/melaz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48511313872.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nf94aa4rait09rvu6er6enoorq/damobibikosolosararun.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f196d34e58---17116181244.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c988e7e90632961afd94d00a0fc09c0b/4314224314.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/192eb0d695c426ef3fea30d5d5ee9a6a/mosomijojuxefedeji.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/85240349687.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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 17120 bytes
SHA-256: f671765d5790afdd3b45bb2a3a0942eb51d073d769fa444994c8d5e7021203b9
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 10604 bytes
SHA-256: e09644845cea9472351957720a0f28e76d8a74559a58fb777e20b70e521d48ea

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