Malicious PDF — malware analysis report

Static analysis result for SHA-256 245d6ab4656172bc…

MALICIOUS

PDF

131.8 KB Created: 2021-07-01 21:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea1b3401d1198c5cc3979a42f423c256 SHA-1: 380182f442fc95eba2f1fa8bbb26e9f14df170d1 SHA-256: 245d6ab4656172bc08a544220c69f65321c52f64c55ac6762183019be4509051
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns are indicative of a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9546

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://queure.ru/uplcv?utm_term=sideways+smiley+face+copy+and+paste PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e00309ec1---luwidimowelaxuvetadimizal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078159b60ece---ritodonunos.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cd5180b3---vogimirefarojawikasek.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6318ec61ec---97567658394.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1e812ffce75ff31d5763ad735f0f4c9b/4779994775.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69b84d39e---jivonewumumofopaxinapalo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/us28epifs2c21kf7l1dgdu58kt/jitejutobenuwik.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a452c1ab---tegexanokajuj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba5185378ec7d611ea9e85e71ac6d8e/74445248731.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/68824431466.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/kategelufi.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/17296592871.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/konizug.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0cc90d9e---biwamokaxirivumilisulodet.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9b3e96405e4dd31f8cb2b90b77716289/sizubuwozatofokoxufojelod.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kezizowuxizozusub.pdfIn PDF document text
    • http://huiking.cn/uploads/file/110646266502.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913685259e3---22491796018.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/kuxuzonojoser.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/voxelisimexo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9da395924---monexozibivatagexenuzevi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e00ac2344fc343f84855fb90d6edff28/92344871483.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7eda4511f---dizazizeg.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaloxeluna.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/56862934821.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 13664 bytes
SHA-256: 8f59faa9ce4ffd0ff8334afc3115c991d8073f6434ac01a19e7713996d6b8b61
font_01_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA6 9632 bytes
SHA-256: 595203e9bd6a57f7af266a5cba8582adc979fdf6dbfed8e2b0c1d3b21b3a7ed8
font_03_sfnt_off0001637c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637C 26132 bytes
SHA-256: ee3d2edcbf37c6dfc728afa75d68f98a3a133b2dccd82afd59823794e9e9b84c
font_04_sfnt_off0001944b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1944B 29124 bytes
SHA-256: bfb35304456cd2b42416bd670a764baeb4f40d661e5b178aa12e44d2648525d3
font_05_sfnt_off0001e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E525 10956 bytes
SHA-256: 0e7d61e465fa7940169a290006f96aacd135209e90402bee047b7738714db7ee