Malicious PDF — malware analysis report

Static analysis result for SHA-256 575755a5f036b04b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 12:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5150775b3781dcaedaadd9b8e37662d SHA-1: d66669a6ff2e873063fb21759339ee045e61b3c2 SHA-256: 575755a5f036b04bdef60ab0c68d01983245f337c76ef8a4a630443f8a8d1178
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=mms+port+meaning PDF link annotation
    • http://pphjako.pl/userfiles/file/pepixamopikimadefot.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2b9ab48660b82ef0ddde376161f400a/93908090497.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/94901204359.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bozabetu.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/zimas.pdfIn PDF document text
    • https://designclarf.it/file/ruritadagazirefaw.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_C384EDBB75A281AE.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/fikuxixo.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/19037871286.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/62440706131.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/45389088641.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/91061591588.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/47130087780.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/muzuteses.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/josedufugik.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903182917.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16141f51f7b69f---63596616077.pdfIn PDF document text
    • https://tomas-music.com/contents/files/zebaviborifotevo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7515f46402b1c19dca5a13571da63b6f/makofunetodi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/53082377065.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/915agg895nfer7pbr0554ds4sd/90660343277.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 17368 bytes
SHA-256: 27e501f3f620828829619d2077ec1e1c3214f1111c11465cb412b03d035a704d
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 10544 bytes
SHA-256: 7801264eaf1ea8c7af839bf46034c6b9222e736755e4e25977bdeda705623964
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1