Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8854066f9b4a103…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 05:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f40ecda8aa64bfa5e4a71aeb74d8d3d SHA-1: 3a557ee24707fbce8f01ca522ec807223be713cc SHA-256: b8854066f9b4a10332d6fbb189c68b6631b65680007cf85616b0912aa1fdcc7b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ventss.ru/userfiles/files/77266346028.pdf In PDF document text
    • http://ayurvedicclinic.org/userfiles/file/gikogomulakegezixujutorej.pdfIn PDF document text
    • https://argumentua.com/i/file/88125775449.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/wusumifonuwam.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/kivukekesaf.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74488824526.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18edd31bf---kuneponimeja.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145eff86ed61---jerekuzefigulowejug.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jarukadapaful.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/68243405360.pdfIn PDF document text
    • http://bankerz.in/qpic/files/suvusexelupum.pdfIn PDF document text
    • https://eurotig.ro/file/9736586715.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/38452915058.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481e57196aa---30491008668.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/71524051801.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/lekipimesilavolema.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/manexobaw.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/jozanogalowuxufinuza.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vekoxarewumosila.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/13955419326.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/13496671733.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/55626168968.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/ximibapub.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zubolisunesel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+sms+websitePDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10040 bytes
SHA-256: d56888539215dfd05a5cf174a51735a9d621235c68da594a93a20cbee8cbf372
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 17040 bytes
SHA-256: 484124a3bc07b5e04b516449f8ce6ee241907649064aa6a0cf83cd42fbc8b924
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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