Malicious PDF — malware analysis report

Static analysis result for SHA-256 1675b828b78e30d3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 08:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d56a90cfd59645e6c4837084bcf8ff11 SHA-1: 9070d9db5fa91f5d1bb04eb8e096288ee499bda6 SHA-256: 1675b828b78e30d3e26c9f5f1c4652432b865acc82b48257a53d5df34b6b1ddf
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://robwalker.net/fckupload/file/22757749512.pdf In PDF document text
    • http://szyqjsj.com/UploadFile/file/20210819095145786.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/35652598027.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/kibezalufupis.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/25042449784.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/38896929325.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610a924c95253---51733541865.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6162cd0462670c52ffaad0bec6fd5c2/vofuzinulidubogud.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/xozorivepagezirelipofiru.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/61882264590.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/68673255566.pdfIn PDF document text
    • http://erictex.com/ufiles/files/rabat.pdfIn PDF document text
    • https://oliogalanis.com/file/sarowi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/739f82ee87f0286e8689e281a51b7c91/melugujamumibudo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4b2c013764f50975d7721e6f593e7815/78060202070.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xotusaxowogeduniwilof.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/wuximeguzinevujovuk.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fcaaa254f3804c147991145aaf061461/bapum.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5215b231343m7ran91lk1dthp8/76944775627.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/918fhnvn1p186cn0hvjstf0ipe/56593574156.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0a772bd0809ec7acec0743b663720fbd/69149571315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+10500+specification+1991+pdfPDF link annotation
    • 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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 17272 bytes
SHA-256: 0126e625837a548ebf8f217146a508e4aa4464c656d15259ac9ba21888913cab
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10896 bytes
SHA-256: 4300459edbacaf0718d987bac071aebcaa1d41ad582cd29271f0118178479bfa
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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