Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b68a51d01c54616…

MALICIOUS

PDF

68.1 KB Created: 2021-08-16 05:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6a3a9f672196cbe9af0abb4d44c40b99 SHA-1: 0c844686614052433f1941c36eb99f4e27260c89 SHA-256: 3b68a51d01c546169c1d872c1b07ce3a8bb830de0b5665f3e9f11beea12fd07b
124 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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.
  • 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://mai-colle.jp/userfiles/file/jexop.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/pulotovexi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384a7ecdb---94295595051.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071822235494.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/53b55ea913d1494191642b43a03c5f86/91636023822.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/40164996783.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kigukutekuduka.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/67818368294.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9200ecedcae3a49169f4767c504576cb/7893959171.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/wigaxe.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0ec4061bcf0b8f0c8044454eef34bebd/13444764277.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22923847208.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/52181173983.pdfIn PDF document text
    • http://houselandia.ru/files/nelupip.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/nugotukisofawo.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/72137596719.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/23202662294.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080874e5bd36---74303631114.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/dovanaror.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tjlantnu7t0udbko8287d189k4/gemovuxaruliz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7dmebo8bqjuorvrkshpt5nf17c/turujixejiluz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baf9e10e3---dugetunaso.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/62788146141.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2c6l7jt05009egjobnbas16bl0/senijegirapojizef.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/977dd2fd34e896e4be4cfa0b32cb5330/dajapibanigiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=utorrent+pro+full+cracked+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 10552 bytes
SHA-256: d2d8c67ff20b6fb8c26b239bc30ee3415630993e827a68bf388745260e6ff74d
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1