Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5c3eaa4bc230cf…

MALICIOUS

PDF

113.8 KB Created: 2021-07-18 06:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57223bfbc29b0abbf6eb45bc3dd379ca SHA-1: 69b9509731a0992e9c881d1892efb57f3bb87fc7 SHA-256: 2a5c3eaa4bc230cffc6c9b970e86561162800faa4c3d923968ddfe51380eb17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://collegium-connect.nl/ckupload/files/kenasipipiwunazipij.pdf In PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7033f6c---26868112153.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/11986052991.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e26c4eefdd240244be6b687ff0de284/jafuziseveva.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9085f216a---memabotuwadusobudef.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/divav.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/21082204642.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/76894885802.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a92883607---jabogiwobebuvurodetele.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/61686997169.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd873f6c8---63964746143.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/22225377899.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/12080747599.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae75c864---51960648021.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/lorigobigosowexox.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e23525db6---fenipakod.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/71238087410.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/av90fqri9i5tmhkkgu1rr6qm18/fawetipof.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s34g362rkrjsqqmivjvd60bh43/19024480106.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/38293091742.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/lapufavusebiponurimufir.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0f9e995b---ronanozuredisasowufone.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d756950ae---dalurelekidekavup.pdfIn PDF document text
    • http://cloverdiamond.com/file/67120121777.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/galegufupixaseveru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lord+of+the+flies+chapter+8+full+textPDF 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_off00015dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 16704 bytes
SHA-256: 320673e8049cef10886ec7e0646719a7deac32c91eb570d736cf71d14436d43c
font_01_sfnt_off00018922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A139 10980 bytes
SHA-256: 0f29a6bf0b5b90f186a1e5b3db4bca6b0d2756a094fed82f0f10eea10f4d7c55