Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95b17dbd2efbf9a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 22:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3188d23de40d3eaf58b5aaa9579aa5f SHA-1: 30197977f2028b8eb410f4227c54738023aae18f SHA-256: e95b17dbd2efbf9ad5575b09dbcc94b6314684f88b285ca2a8ad7c9e6317e878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tanabuauto.com/js/upload/files/37647135770.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d59d8425c---79290488889.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/68696104877.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/25630159789.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e6a0733b---wulemu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/555de28e1f9a3299eb5dabc9fa6d787a/nubez.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/12253673221.pdf
    • https://autoteam.in/ckfinder/userfiles/files/87801735174.pdf
    • http://vipnovini.bg/root/f/uploads/files/najetimitalub.pdf
    • http://bebelino.ru/userfiles/file/pefosumamaresupaboweguwu.pdf
    • https://supermovi.com/userfiles/files/fujilevebitimuxoxerera.pdf
    • https://nmg.lv/img/uploads/files/kinonisajukunasitasera.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/lefujugazizapet.pdf
    • http://thegioituigiay.net/uploads/files/gevigilop.pdf
    • https://cortopolis.ar/userfiles/file/befefovogunujoxazul.pdf
    • https://ritascreation.com/userfiles/file/xanogikebaxememeb.pdf
    • https://alebusph.centralcms.cloud/galeria/files/3255819671.pdf
    • http://appartementslisa.it/an3_Uploads/file/96744687171.pdf
    • http://voijin.com/userfiles/files/xuzesubikuvow.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1887c22af---vajokojiremitulufevu.pdf
    • http://megat.pl/uploaded/fck_files/file/64312699098.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/55156802742.pdf
    • http://tootingtaxi.com/survey/userfiles/files/12051954377.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4eb2ebffe89274b4ff337f82111370db/76123983416.pdf
    • http://355353.ru/userfiles/file/85788199306.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/risuleso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kodi+in+firestick
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd8.bin
4695b0fddf57446fd84cde30029fd0baf22be5f044ca06172d4ae4658156637a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 10344 bytes
font_01_sfnt_off0000e44f.bin
f0c6c34cdaa7fc5b4bcbb3515a6801df7fa40c3ea66867313d7a4eb5fdfd94ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 21228 bytes
font_02_sfnt_off000119ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 16792 bytes
font_03_sfnt_off000131c7.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 1680 bytes