Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba64a6c8012a104f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 22:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91f6e0048d37d73b1990bf25ea0e2ed1 SHA-1: cd365113cb725e74a914551ec9439b1d0fa77769 SHA-256: ba64a6c8012a104f8420a51f24895b04e6d6e38cbd3327da6942da7ebb505e47
104 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics flagging the PDF as a link farm on disposable hosting and pointing to compromised CMS uploads. The presence of a visual download button lure suggests an attempt to trick the user into downloading a payload. While no scripts were extracted, the numerous embedded URLs, some pointing to PDF files on potentially compromised sites, indicate a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bannhuaduong.net/upload/files/51592214174.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/julijefajafi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd0120d45---25726296736.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b97b4678f---lubufuga.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5c0587f6---pelupu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/87717431749.pdfIn PDF document text
    • http://immopolignano.lu/images/28080651695.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/27098247993.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/dukadakexuxedaxakut.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83263303470.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/23916248999.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/levedenuzezifa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e30bb7c9dd03c12237fd6b61fe3f4639/2788883370.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/remawixofodogotujur.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/67472956215.pdfIn PDF document text
    • https://loyd.rs/images/file/82922468276.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hfo61c6uqp2d402ef4va7h8s0d/72933958720.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/48601388956.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kawinozoje.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/62510263611.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/87825758372.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/wefiwowitisazezebepowi.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/52198207418.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021941610389516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ff+free+skin+apkPDF 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 18568 bytes
SHA-256: 6f525b63a9fdee41a92655d6ef1cb039fb237f02f494deacda906e471f089b08
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 10156 bytes
SHA-256: e613728e181f18fb5b844910cd3b06de24e26686f5c45f64d9c3754f0d3ddcdd

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