Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d99be0837983854…

MALICIOUS

PDF

77.5 KB Created: 2021-07-20 15:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c76915bc5be3034dfffed3288b5166fb SHA-1: 387d1ef1c6070c80b5ca28e12bb9155d64d5f45e SHA-256: 9d99be0837983854d3aaf93bc3b4bf586af629c81ce20b63b6ba5efd5b3adad4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lapofukepef.pdf In PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/mudebomarukixobazepemivis.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/mokukazovoneso.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/28667272980.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/92336602884.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xikasuvonorilafolawalimot.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f4a30b24---jeluxitiguma.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5f09e5742a31e3d47b133bf2b575013f/35837312197.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zubitubiberodevuredazil.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/75200409614.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/irja4p89q9426vtrb3rnfplc14/24414332969.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9805db93f4---88622882298.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/15afd5b77589dec61bd48028eb9261dc/57467699778.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/paruvot.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedbabf6c1---79127456527.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/judoguxafigekizi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/sunasixopadamozoroxofuzud.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cd826de0287e6c4dcee0dc220281c2f2/83495498932.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/89517765453.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gobukikumaseg.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba6973b63---60481691831.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/b47virci9lnmj2kjr64ecfmke3/82293722456.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/suberiragazamaxe.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/fiziwugipebazutivuwo.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/96402191537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=8+ball+pool+unlimited+coins+and+cash+and+cues+download+iosPDF 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_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 17052 bytes
SHA-256: 24a6c7935df5a43b71be035ca1d75cb78a11cbf83b41fe47d9d91f7770a188ae
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 11116 bytes
SHA-256: b69e9b1d6e1a1f01c0c2644c5f249693e339bf78cf092e74c6e561dca0e24229