Malicious PDF — malware analysis report

Static analysis result for SHA-256 577d1949bb9b2368…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 04:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da0eb72e35362cee90f5565450133352 SHA-1: d1f6954057ba872276d3b8ec68a8e7316288cb0f SHA-256: 577d1949bb9b2368dffa0901daef9994660b36f366f26f0365ba34b3cd0bacca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://limsurempat.com/contents//files/41286927790.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ske1e1e0tua1j7icps25tid7q7/38562559466.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210827140652.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4fe0ffcb---83463039580.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618ec46b40---ripafutikeravotifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a041ec69a93---67285574002.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4rvdfhlrtpdufi11p0gol653gj/71684652464.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/94728761610.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/pubare.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021080421590571.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5eb71678b6dcb4331f3207e55abbd27/lenobisadir.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/13926126552.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/dewolidabowitetozoxab.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/955b637964d6d760365bb8d9baaf3d90/nudemiwararusidajuginuli.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a01b8a0d---rogadodonebotevexidumo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40838264848.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/navep.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/18754342387.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ruvopawepaf.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/12121252201.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/regavurutog.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/sutawutawiniso.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/velukulemisisekinasakip.pdfIn PDF document text
    • https://bnovum.hu/downloads/lorubupowize.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb0e38174f---sosudi.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jodilowisanulet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=direct+indirect+speech+sentences+pdfPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 19204 bytes
SHA-256: 3cff8d78d40a621fb8d86922e43e1e083a55a7008c3e23909e5a5036b7f660ea
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 10392 bytes
SHA-256: 236a9fc2da2c77c904ddd7fdf358e6704eecb0e7bc7c381c645be6007373a836
font_02_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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