Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fef2ad5eadd8291…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 05:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7577f89d1057eb15de53424cbd95aea6 SHA-1: 3e558bfd368638b659a7599e49c4679efc2c3175 SHA-256: 4fef2ad5eadd829179520631592ef193c459372676fc169b24fc85a45647fedf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic findings indicate the PDF functions as a link farm, likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=working+coin+master+hack PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109082053438636.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/zunuxivosim.pdfIn PDF document text
    • http://wixoon.hu/upload/file/41847215966.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a7ea61dd---niwofipazigerafipudakuxo.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86450366405.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/11049673525.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/zuvavegosofepudifaki.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910050600325019.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/lulitevobanaru.pdfIn PDF document text
    • https://aitalk.vn/upload/files/dedifanazotejoxawawafibat.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/nobubulife.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/448602d17e7da46ba4baf75040a12ce9/xinanemeref.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a2ae5439689888ded0f6b80abb4b0e12/26335004018.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/joziwexijunizema.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3073b3c0b1ad29c1047d6140f960734/taton.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/79201756370.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/mumefafopipizanupamik.pdfIn PDF document text
    • http://grabnerestriche.at/11887498300.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nomojasigefizidasiwi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/8852686929.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f983d6d79---96130417264.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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10716 bytes
SHA-256: 18d4a2168b4400e1a34223934658aca38ce51034b298dfb4f69ebd1b79a3a1ba
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 18116 bytes
SHA-256: a9c231ddd45bd485ce0b0cf786a66bae5dd045b0a15f41f0d9ce64f745bc3af4
font_02_sfnt_off00013c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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