Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a9db94533ebc76…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 01:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb21f92b08bf41a91c8446865c096f7e SHA-1: e1ed469bf01e50f9095ef26fb5da9fc0013e5d87 SHA-256: e2a9db94533ebc767bf10d67dbdae8ef3df2b680882a0b26f11b8f3b7076a2a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=powerdirector+pro+apk+full+unlocked PDF link annotation
    • https://konchris.com/userfiles/file/1630683979.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/digiruxetuxogasep.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wunufozusufe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda395fa11---wokixibedanev.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/99904030005.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tibosototupakefum.pdfIn PDF document text
    • http://dakov.hu/_user/file/tifevudizujiwetinifiropax.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wopemowaw.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/duret.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1d867e3f3d5ac760f36afc64e91a4d/pezapafukuwonijezaziro.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/37405470505.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210909115336075391h9rona.pdfIn PDF document text
    • http://candientushinko.com/images/file/vufukon.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/81540706158.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/xegafurufife.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/xonajumivixuk.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/lisabemivevogenuxadudazo.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/88906579540.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7d73932b20386e3c76c7a307395781ff/lepemobukutixizova.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/70789378069.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/85514993786.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pebanuredu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/25773281533.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 17380 bytes
SHA-256: ec5867c0f2a78e2acdf495a2c3ce42bb1cc5915e5f9ace13bf8316e8518020aa
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 10724 bytes
SHA-256: 9c7ca3272d4d00868025c588c6ded9b871e7c58f1b7d32cedcce3039cf1f0d88

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