Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d144a2830ed1e74…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 23:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9099e1c011dbc24a598ccd19279305f SHA-1: 5bb91fbf8931854155c8f7a799e652e2dcf95c84 SHA-256: 8d144a2830ed1e747e42a6c87f78be0f9a23d1267db2a6007a32b7b43e05c659
124 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The presence of multiple distinct hosts and UTM parameters further supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 https://inwebjor.ru/uplcv?utm_term=dell+t330+server+pdf PDF link annotation
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610071515afbc---84950606057.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/48688845637.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/13658660283.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/532797594515668a883587239c1f7079/46474899062.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/67300129068.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rvqibvhqfor8599lhbsjpke63m/pemudabow.pdfIn PDF document text
    • http://attlas.center/userfiles/file/wogejavotedowidevijutif.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/011eb9289baf12cce4b67d3bcdcb4011/rerawow.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/27916ba92978bc8e0c3e41a67c3a50cd/pogopagesiborovebugobum.pdfIn PDF document text
    • http://yuha.be/_files/file/40521388420.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ad802d61---64701685591.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a407a940---34072601586.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/82685030713.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/ponazerawubemujusovo.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/xanutekepanegabora.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/lesokad.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/pevubibixagoxemobeju.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f6c64c2f---84965292008.pdfIn PDF document text
    • http://protok.pro/upload/files/7242911306.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vinutotimozepetafa.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3d0f1862455aeea18fc9c613ad367e21/xuvikusatasipokavogud.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a2958da---36747606473.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/sizuwosiv.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210822055016.pdfIn PDF document text
    • 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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10376 bytes
SHA-256: 9cec70e2c71a7799e6ecba4b3c5e2b423dc68f31a23c6b4db6d6138d6ba54469
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1