Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1212269720e596…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 14:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b8d8265c3ed93eb8f2733db369a52a0 SHA-1: 91dc5f2de887135ac771f83657f64ef33f0cb7db SHA-256: fd1212269720e596f4b532f4c331eb07f9c27ac6d9fdf71a5b721540647f987c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristics indicate a phishing attempt disguised as a download source for Windows 10 ISO files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://factblogs.com/uploaded_files/userfiles/files/42837551130.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd6f1edfe---6761446254.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73c93bb43---4538307751.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/97043862973.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/navoduwufi.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/sitiwawagupolatebulojudep.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/xusoripesubo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/20854829756.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/zaxavirivikuxoxixusewu.pdfIn PDF document text
    • http://szpk.hu/_user/file/didijuto.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109060459199445.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/73069899785.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/87131901522.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312692bffab---66093134359.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631065610.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/53444332310.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/826718540.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/siwevukafod.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/belof.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/46668758821.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/80879869601.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/5685240693.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f29fdd3866b4c52dfe8499d52281c70/5824591373.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e24d890325610e3ffdf2d1270465a9a4/gopujomed.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/22030992411.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/6216677281.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34987584666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=windows+10+iso+file+download+64+bitPDF 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_off0000bc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC41 15888 bytes
SHA-256: cb2b5bcf0762a34ee861c79bd328f5ce336d5cebda14d202069422993a0ce2b0
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 14656 bytes
SHA-256: fb8a170c2f7823dde7bedaee36507334cac3d1325fda6aeecdc4b7aa8ffa1d22