Malicious PDF — malware analysis report

Static analysis result for SHA-256 b625f355436590dd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 21:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ace01c4f7bced562a33035f65d493d05 SHA-1: 6c415768cc77cc2d02bff4a830a9592aea8a02fd SHA-256: b625f355436590dd20981287a06d568e04c26fa60ad3a04e5311184d77d35e57
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=windows+8.1+pro+n+product+key+2020 PDF link annotation
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kadigejitef.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/54405623851.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/giporis.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jazotive.pdfIn PDF document text
    • http://195exim.com/datas/files/vopelituguwalarenupez.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/devakagot.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/9834305833.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/17744230712.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lolupasuguwilu.pdfIn PDF document text
    • https://techlan.pl/files/file/wapagefojopowalomepebiju.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210916154630.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/rumezoneferomaseb.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/29o1vqof53mjp98qjmptmbtmnc/96684574897.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/12807068241.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/94133291379.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/kogepupadidemozog.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0747eb54974d0c4d5cf0737ec37fea19/50627065035.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/wamivazisixawafero.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0d66183e---sovuzelevalida.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903011335.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210904101436.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/duxutibikugot.pdfIn PDF document text
    • https://bloomeng.com/uploads/66397297997.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 18476 bytes
SHA-256: f92c0d2074763b68e25f54fe192c6f386db66942a8575c617c8281c5fcf30dcd
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 11252 bytes
SHA-256: 7a561641280b4585be2e923ac34ebdcb79e151f69a10b60414b03cd27948e546
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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