Malicious PDF — malware analysis report

Static analysis result for SHA-256 4713c2f7f8045446…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 04:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fe8c58e2355c72aa97cbbe23f4b3ded SHA-1: d704b3dd18bcbf88e406c0157e2ee98b40bb1e3d SHA-256: 4713c2f7f80454461465f277f895ecd7e9ae32b57a0523bb7a6449dcce065621
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of a 'download button' heuristic further suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=fifty+shades+of+freed+watch+full+movie+online PDF link annotation
    • https://delaneyllc.com/ckfinder/userfiles/files/57339513191.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/5400909246.pdfIn PDF document text
    • https://euchebnici.com/img/file/sageruzulezisi.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/51954598189.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/24847039883.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ac2b1c88f4959182b0a7e146065f250a/xerafibivugujomenidaxog.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f8831726---76085324599.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/mexaboxire.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b1cdd166---totuniribelaruda.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralakasekopubonote.pdfIn PDF document text
    • https://limsurempat.com/contents/files/dipurolugufedijel.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/29080301714.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/lenokut.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/52195181597.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210913093523_1752764637.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kovuvij.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wutuj.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/resuvugoguz.pdfIn PDF document text
    • http://machulski.com/public/file/nimorisusepase.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/21852682833.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/47460040070.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/1935081995.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d95a7cde---41344699210.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/toliwisiwowatujefunur.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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 11084 bytes
SHA-256: 4686fd61e41dfb2a98d0776a04519a50b3790f761e6665868f4bab40db21217c
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 17624 bytes
SHA-256: 71b06b7e5b613be46073f768647f6dec1ea1665be082a6da4a7e2428d63d647c
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1