Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c139b561eba155…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 20:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a72faf947631daed490b471553ff840 SHA-1: 466725ca70a04f6207c3d7e22260f5e94ea757b1 SHA-256: 65c139b561eba15593a8d992d48608a78a8d7150f4d8179af9a45a0bbdb24be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://onsale.social-push.cc/data/fckeditor/files/vimumazobo.pdf In PDF document text
    • http://vetcasatenovo.it/userfiles/files/xagavasizuzujepotup.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jewefu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139229f413ea---9794733079.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bomifi.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/56553672475.pdfIn PDF document text
    • http://dytac.hk/userfiles/32395507355.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210901133102_n7bo0g.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/duximawolixanimimilutav.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/lenunabavonovonipavedidun.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210918_050822.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/35623117478.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/gowubes.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/bogosebovafonavawifup.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vivusuwoxudejij.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/wiripuxowalikajevopa.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/junok.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614502a9d77be---viledoxidelizalivojobug.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/37272565328.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/lakufufokinuwuvujedomowa.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/7828064726.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/13558050965.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e7d58317---legivelupigadidomaluz.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xepux.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/lilimagiv.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9bd1a0ce---88957527105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=grammar+worksheet+present+continuous+spelling+rulesPDF 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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 11140 bytes
SHA-256: fa2b7ba295362e0ea6f77117567a10a3af11c5f6801ad5bc3d92425335eb5f59
font_01_sfnt_off0000cf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF67 16984 bytes
SHA-256: 86c56758a37ed08b3c34060656acbdeb4930550cabf7c1da016a6ff4497cc563
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.