Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbbd6d0b5a0941b…

MALICIOUS

PDF

61.4 KB Created: 2021-09-21 03:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12ecbf81c92a7ed222dbfc8a6198504f SHA-1: 8ce49db7ba291c67774c5af378d73a849dd1f035 SHA-256: 3fbbd6d0b5a0941b66d6585ffeeab74271ce9155c0d7032fb325b277f26e932b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading additional malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9393

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://etenindex.nl/images/uploads/27837941612.pdf In PDF document text
    • http://myucpb.com/userfiles/file/budemeruvapetikupup.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef5fba63e---88251350215.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lobef.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xuwinalulil.pdfIn PDF document text
    • https://kawanmto.com/contents/files/69801981130.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/siwadobetanodevopabonif.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/miviw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nsoddk2973dabkeui9qqmkti11/mafuvilenegux.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xurorusub.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907175854673653.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2c57f189---pogafinoso.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/vulenib.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/37607796880.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/96544828101.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210914_C6FC9B89A7F20892.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/zomuxed.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/32218984349.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xiwutigamakido.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/gisokomub.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041838551920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=avee+player+mod+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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