Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5fe6398a0e458b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 11:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 890fa764a896763324ecb63de9a616ac SHA-1: 2f3e3b37f1b94dad7dfeaa5a6559d265d4d59784 SHA-256: 3f5fe6398a0e458b38c93a337a9af34f7eaa46ca8052cefa6141d70bb04a0c18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tencanpowder.com/d/files/defizaseziwemib.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074700be8e32---tapugufuzewimom.pdf
    • https://charterboatdeliverance.com/uploads/files/69263397337.pdf
    • https://baobihungphu.com/media/ftp/file/jefokikasiweg.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b0dc8abd3c08ec138f3f071192cf894/mojoguzi.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e44657f3---merozatono.pdf
    • https://majorsagilekvaros.hu/uploads/file/wazubavukozonufugup.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087279ccd467---83873474377.pdf
    • http://akcjonariusz.com/UserFiles/file/31678450095.pdf
    • http://okwmd.com/upload/fckeditor/file/rarizowebadinewofofamotux.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hg6i19beuo9tkvdvqidk7c2102/dirosutipijuvakutuse.pdf
    • https://oddluzanie.net/userfiles/file/87365385672.pdf
    • http://kiuanai.com/userfiles/file/lizipaf.pdf
    • http://sanruou.com/app/webroot/uploads/files/volikadunepuxobime.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/46dcf8992ff1ea9917ff63c1d5a78e31/pofumomupunosizonewi.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ccb18134b09a156421b1c869e1fb58e7/80260421766.pdf
    • http://t-p-fortune.com/userfiles/file/kupafabogi.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7aa401919f2bac53a163f63db786f599/zalutavujidirajodiravaza.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/imdgiif2rtda1faqnaiib4fqf1/90448586403.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nj4vppht71u4o2396vthrdq849/45960951387.pdf
    • http://01host.ru/userfiles/files/juwofexixeroxetubemuwa.pdf
    • http://nordicaluminium.ru/userfiles/file/jejomezikulimi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=protractor+in+geometry+box
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e691.bin
e715794046422e03bbeb85239d56e078db437eb96ef636d090371efabe7a16e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 17216 bytes
font_01_sfnt_off000113e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 16792 bytes
font_02_sfnt_off00012bfa.bin
f4be9e5f06d34872e2e26b469b3f3bb43675832930e0cf2bdbb3b010de008496
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 10716 bytes