Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61a44a712716ad4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 203284e6ef3ea220954604bf08765c6c SHA-1: b5867cf6ba9e0ea1112cb7804f5112375d73cf2b SHA-256: c61a44a712716ad47a8f6197bb599689ed57f7518989ada30a082acdcdb87fdf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous URLs, many hosted on potentially compromised WordPress sites, suggests the document's primary purpose is to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d92a474f5b9a2044a2e2c885b220640b/torelonubivegapufosaroluw.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bc23590a4618bbeb825c6866ee0f199e/sudovorewizesuxuf.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/safodejukavavariwovasij.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/wufazibubotapurul.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/20583207420.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/dotatosebese.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142edaeb16f7---99654379267.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/553816617.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/fixutikonepirefudiliwizi.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/33745482907.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c1a8c7045---75218685089.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/diludam.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56c6137dc---janoginifareda.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/jezagogasapevemixukol.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/wajopotodinefujoje.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/vibulugozomejepepawewe.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/71448857768.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dcce42b174698e23d7c621b9ed32ed1a/widemadutoga.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/85049702252.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/10816268833.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/64886298990.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/051e3f529b64c213a4c159f024e06dd7/pozatepipefojafop.pdfIn PDF document text
    • http://gestioniarmatoriali.it/xabesilavazubaw.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/18734649634.pdfIn PDF document text
    • http://modern-pro.ru/files/file/jumevazujirezojidadoja.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143315d26125---lasufudonujevisexu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/3970054882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=install+font+in+android+phonePDF 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_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 14704 bytes
SHA-256: 0d5a82489d360bb3a6b35f48378b9579cc4aea53a55f568bc01186d9c3e94e00
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10548 bytes
SHA-256: cfc01b92891cf41c454f64ec2346d8874106bac77f5bbc288342344cd0905d68

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