Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f41479a3a26cc9c…

MALICIOUS

PDF

152.4 KB Created: 2021-06-17 09:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b879aba8341bb3b175adbb375cf3f956 SHA-1: 9adc79ac325211ce568d41a10ef4bb0616282883 SHA-256: 5f41479a3a26cc9cc2c36d7f3ff67012c3c7fc0174cf8e4f32afd8e255e017fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of the 'utm_term=doraemon+full+movie+2018' in one URL indicates a potential lure to attract users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=doraemon+full+movie+2018 PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e541d561d8---25885392018.pdfIn PDF document text
    • https://12tiga.com/contents//files/43345060281.pdfIn PDF document text
    • https://loctra.net/userfiles/file/2374154144.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504014918962186.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/buik28p27qsin87q8brc570k0n/tepiwon.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/73867893073.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/0f14f7bb11dc3372b0ec391e475c782a/9056195150.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609891e4d3326---11505669635.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/53bce428687c061b45ce0fbd1ea2438d/62278950402.pdfIn PDF document text
    • https://people11people.gr/uploads/File/23439994501.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zabexugevijovumusuni.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/43c580dce8f3c15d2e3a371a1ab34604/rutuzesevezegamew.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609accae92395---zotuxu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78274886e6---jekenilu.pdfIn PDF document text
    • https://airshow-bg.com/file/pedukuxumol.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3c7a71fd16---8586781359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 83328 bytes
SHA-256: 23dc94bec2048382bc8d29940c0487dd21e4b6b415b1cc1232b9673eba54babf
font_01_sfnt_off00020ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EF7 5316 bytes
SHA-256: 942ebaa29c3f413edbad4848135d5c286b674092b7452163843bd4ea74980709
font_02_sfnt_off00022105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22105 20176 bytes
SHA-256: bf14ffd41200d7853d5409511129987155bfa6691b192d56583be0645a7ade1f