Malicious PDF — malware analysis report

Static analysis result for SHA-256 149f0a9f22439ad2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 07:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b4d5c6581da336a154694eb036f4674 SHA-1: 6bd3d6462f15e8a559ff723cec64afde363610b1 SHA-256: 149f0a9f22439ad22446382c9cb535bf0c75504839429cb9260ade8e915d2ab1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e8d283f4fd3c8e007981f89fa82709d0/wivuwunix.pdf In PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/52340877029.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/72847510910.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/lebuk.pdfIn PDF document text
    • http://fygl.net/uploads/file/041433204205.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/932037a2b3f4edabc0f9d61ebd8a8aae/64701189724.pdfIn PDF document text
    • http://104408017.linker.tw/files/79217241593.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/15/35888206189.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/rimanaresesidu.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/latilifug.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/lojexel.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/pipilupo.pdfIn PDF document text
    • http://katela.net/userData/board/file/86854237128.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/tizatomikeze.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2849022755.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/1890848822.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/30714155433.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/3551601016.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rirojumedaresekufo.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/24430564047.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e637697b70cd943246163f20d1e3a50c/38314524979.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/56990378889.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc699ca69---tagefumapiko.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/funopodasixurezubuxatin.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/xelijonagokofage.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/wutazepomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=corel+draw+para+tablet+android+downloadPDF 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 19852 bytes
SHA-256: ce45d2dfdf387df801ceafe959c85882262759d6d2b5d3f69c049e61a2af2147
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10472 bytes
SHA-256: adb9dee155958c9943cf11900eb8e8a00036e40b3bab53c441d6e514d0db766d