Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb2ca4385eab22d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 08:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57a6e01ad3367e5e7b7b3811361d8d70 SHA-1: 32cea741a6ee5959c9d104d400b4d59b66692626 SHA-256: feb2ca4385eab22df2d49899506d7ac8601aa0c0ebf5e4e9145c6fd5900dbe5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate the document is designed as a link farm, pointing to various potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://manenshop.com/upload/files/91484257492.pdf In PDF document text
    • https://nslogisticservice.com/userfiles/files/48932933078.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/dagaf.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/bevefirufif.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe66bc11a2---gilibijanokerajolukati.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6ee81ed7---renorebubizitapofezag.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/1245884049.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pizuvajogusokazomo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615118598475b---54610308943.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/fadiliseronekezesetunofe.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/19554667698.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/10246976292.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aebce6c4cc---vaposovejimowujewaludefog.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/xozosiwun.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/matip.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/13620212821.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5921990701.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bovefexipiwokelijinati.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630677491.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/90rofd6rpdvophv26fp3dc3g77/dafowepalerumozakukimako.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50883447960.pdfIn PDF document text
    • http://chayka-svg.ru/files/74513771229.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/48321343135.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c146750158---govuxuniwagafavutofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=emailing+a+resume+samplePDF 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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 10460 bytes
SHA-256: 1782104a87a0b66f3c715d8cc9ee68f9f21be03e3e330f7a4bf27c3497783467
font_01_sfnt_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 15816 bytes
SHA-256: 0cadca4f2a9754eaa9a23365d2a9622570847acbc1a8cf907b1932acb1d01d3d