Malicious PDF — malware analysis report

Static analysis result for SHA-256 690f113f049f7269…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16a590b1d36c6d37645d045ef49cd9b1 SHA-1: bdd807066d32a19e09b809dd8d98c0547fd93160 SHA-256: 690f113f049f72696ecb4e73d44e4dd8602a320bd33d36d29c0a2c4f1be7d616
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=one+piece+manga+apk+download PDF link annotation
    • http://gonvvama.net/filespath/files/20210920040550.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/76424682750.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/jotuvominijapotemumapeve.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/59419123040.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210904_14C7E62444C6393C.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133db282107d---88625974268.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/91327974020.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090804170911.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/xiwoze.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/5726612846.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/82642693321.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e487f46e5a---5372254639.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/wuneto.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/86770173163.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9203b195---pomuzoraforiloda.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/lojugegodataxuru.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jomavujokofodunepizi.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/fazotupan.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/noweruduxip.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/muganitekuka.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/21627990559.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/95154395805.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/47823693867.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45868602545.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/73050267023.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/rifuvitowusuvowalositeg.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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 10696 bytes
SHA-256: 2f9f5af3cde43005a35622e0126248825aaeb3702a6429eb688e1b87e9b1814b
font_01_sfnt_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 15672 bytes
SHA-256: f72421b5facacee5c311ca5d720eb10461e8cd7bcc77d3c6479467f4e3516f39
font_02_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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