Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a9c2e23ccf133…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9212f0ee999cabba7714501f9cecc0aa SHA-1: 720bb1f361c64133a66e62ee45c9a4742689d17d SHA-256: 838a9c2e23ccf1333a2c0ca8c9ede8886dab2a94d6f720cb8dfcb1aa71f7358e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/3757fbff88388c0b6daa3da6e781b889/78251211070.pdf In PDF document text
    • http://a-pluset.com/userfiles/29187607016.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db9a5adb4---1254633662.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/10515038662.pdfIn PDF document text
    • http://patroha.hu/file/60958306018.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c748d80fa43---badopigemaju.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/74105017439.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/mefevifidezusepekadoli.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607246b286fec---50649752174.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/75660671426.pdfIn PDF document text
    • http://ipceurope.com/assets/file/sazaninutipomef.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/36570768158.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fexuvoratigewuguvuko.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/48967341895.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/4281010282.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p2ujrr6qb9ui2q6tgargb6r37g/laridudozujikiwosifa.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2d966122f1494ec36e27e2c91c51b76/77171741744.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210816020114.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24330521657.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/40683112952.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62192af35d---84290321215.pdfIn PDF document text
    • https://beaszemin.com/files/judafowom.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624295579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spicy+sausage+stuffing+recipePDF 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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 16808 bytes
SHA-256: 953ec94b15dc8bf8b8b20955e8cf6056d6ef74f34a4e10d6b6412c5f6c4a0e18
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10780 bytes
SHA-256: 5af6b1e036970cc9c0524a765c17c1ffc6738226a20e1821a7ef2ffc0a84de2e
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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