Malicious PDF — malware analysis report

Static analysis result for SHA-256 118b1335ba2cbab2…

MALICIOUS

PDF

99.3 KB Created: 2021-06-25 22:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d64eea03fca72ecf7ab9a64d9d42c41 SHA-1: f1c521edc11eff8593291c32853984fd5c386286 SHA-256: 118b1335ba2cbab221379893b88d7abe7e150ccffdea1d1580e20db1d766204d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://inwebjor.ru/uplcv?utm_term=answers+to+silly+questions PDF link annotation
    • https://usssecuritate.ro/userfiles/file/21530701470.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wituxeruronezopikuxatelow.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/55542756766.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c265f001---remudewafazulaxatu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082986c5bef2---81030673272.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/sekuze.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q1qt7pnljurhqsc4smrj18hbr4/14036838630.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988831e0275---28648302884.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e2ac0e64f56cb11d2fa6eb77b87520b/xituwuj.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/nejedaro.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/tuzazefafesiro.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/49356ff49465bac4992f499f5e65ed41/62929566729.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6dbee8c61---17447296579.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/96911314612.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da49e2982---8344688115.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b4f235707fdbbf817b8183848e6d8882/xizigenuzazutetodeturili.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/33b07625c8f73b970ad31fae911647e9/nadam.pdfIn PDF document text
    • https://bio86.net/fichiers/25102291396.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/55473500381.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083421186bab---zaxikaxuxofugavemur.pdfIn PDF document text
    • http://4bx.pl/public/file/tizegoforu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720390693ab---7898350170.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/74472913388.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096afc6636e0---40719732530.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_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 10364 bytes
SHA-256: 958ce69a5bc69721d99cd671e3dab1fb374f17a3b3754dc28f00e5e8e4e3db53
font_02_sfnt_off00015015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15015 17616 bytes
SHA-256: 444317b9962c4152e0c65f4572abc6f19da2429d0e8199f6159ca367f5f2e3f9

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