Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b02e43b43a770c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 408372bd0cc0b0e053bef9d99e676817 SHA-1: d03231d399397ef051bfa4bde2c6f815349c49e9 SHA-256: a3b02e43b43a770c588368b1cb89e532d334ca85606c516604246e3232514701
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or facilitate SEO spam. The presence of external URIs and the nature of the links suggest an attempt to exploit users through deceptive content or drive-by downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=android+i%C3%A7in+flash+player PDF link annotation
    • http://caphegiabao.com/upload/fck/file/jumidewudumiderasifasipig.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6f8d42e9---napapejuz.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/59147112142.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a49177debe85ed6e1133d6026ff8e4d2/45006026654.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/daverogaj.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/81985239892.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/58164799695.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xaxuvivig.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3bed9085083fef42cf5fb88c73ed4c9f/75624641202.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/woporaxizigun.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/41132904183.pdfIn PDF document text
    • http://africareview.in/userfiles/file/50563060733.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/wekoxepakijokara.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/25971067558.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/80534508403.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jipadati.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210908/files/20210908091828.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kavivusutoxavoditapofet.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/19157111068.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/segidofo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/daveludenuxixupali.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/48737481745.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/87487232634.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/50225904485.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/rokukuleraxajiden.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/749aaded57865656b74bbbec86055066/5064629441.pdfIn PDF document text
    • 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10788 bytes
SHA-256: 8a3a1c250ca6f314e25dd7c8d1a29114cd9436cccc47eed8828d1680a1c45ff2
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 17096 bytes
SHA-256: 47177011fe58b8752203ac42ebac95fa3bae689fe1e66611e30a718cb8e3772b

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