Malicious PDF — malware analysis report

Static analysis result for SHA-256 809efdd3704d06bc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 11:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2df2e7af46287f8431562ec3f4f3bc51 SHA-1: e4cdc13bab4dc63c4fa492bf27c627cbe8feeeda SHA-256: 809efdd3704d06bcdeaba304dbe9b0085e65d3f5d6773bbee6cdbd67b7e2fb6a
164 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=justice+league+the+snyder+cut+full+movie PDF link annotation
    • https://pakianco.ir/data/image/uploads/news/files/zemefibu.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nunenisepivumasikasezaz.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xozabojelajarewi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0b0b75d3bb9850eec7ad02de1fc6c5bb/kagelalumopez.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/juwolinopogaraveludaj.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb699b279---wowejafulasowaxusu.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/42286515397.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fuzufil.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91976067383.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/taguboxewewop.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/xovalet.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/3356502713.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/1501161521.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/soxetogi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b9d4d815c1ad5eb9eff969768b95ce8d/luwaludulatufumikiwagosad.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mitoja.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zagewelobewipa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614387c107e63---ruburidotuwewajadikun.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nozelo.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/kaxogasiwisubu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46d0589a2c066c329291d557c7fd1d82/dejisexixijipog.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/wexopatavokonelux.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/66604558138.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/80416797371.pdfIn PDF document text
    • http://salt17.com/userfiles/files/46314471773.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/fewukebobajetapa.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_off0000bec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC3 16724 bytes
SHA-256: d5c11f08860e0e4ab856feb6a5f0f8edac2412a7eef4276edb2a360e8087c53b
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 11192 bytes
SHA-256: ecc9ec74c5d25550d6b01d8b07c76b7293d3a1a7867b43d4cb8dd7113ee37603