Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6c77a89d8ca1d6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 09:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2494f4494556a4a3fc2f1db7a213a8e7 SHA-1: e0c311fa34620141b7b5641ffd96c7f565176ea6 SHA-256: dd6c77a89d8ca1d63beb970aaacd0aa9018c344e440d8e6e35e1478212f34b6d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4599

Heuristics 5

  • 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
  • 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://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f29628ac---2530164049.pdf In PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/sepurixefipujeluruta.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/kaxavigekoxudijabomanul.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vrkl34isjumfieotu857pbibf1/15297143682.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/pawupefoworaj.pdfIn PDF document text
    • https://securitydm.com/slicice/file/50228530837.pdfIn PDF document text
    • https://cubic.is/userfiles/file/40242353193.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fijumixelugefipuzadozo.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/rugivemazex.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wigibituxanonumajamafu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zebegin.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdacf2000---75147576404.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/kugogulukuxixoburorinu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/pofovelajewa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/manamigexep.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7d963b389d8cea0af2a2ade77a4725fe/guliluwi.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/63239353035.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/tinukomej.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd90f61dbc---26472750211.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowikaxewebowowesuz.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/kores.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/82989648437.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/filezoxoputivegadiken.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lusezotilekopid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=c+language+basic+interview+questions+with+answers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 18220 bytes
SHA-256: 6762d9e039917ad5f0a6e32c11d6b8c044da3fbd9b6be81774e31b32e1ec06d8
font_01_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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