Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eb6c489718eadf…

MALICIOUS

PDF

113.1 KB Created: 2021-09-12 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf041d55b2ed74f841e05f7994bf9d77 SHA-1: d232ce1492b83ac86323733a83135721b55456f2 SHA-256: 43eb6c489718eadfe985d8d996b474d653eb8b6d525f5b207c26b5336f3c47ec
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://hooleihomes.com/cms_images/file/7077918558.pdf In PDF document text
    • https://repetitorebi.ge/userfiles/files/jekekaxotavin.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bakanenebajosepogofobuf.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gedalimazomufafokudo.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/67740925753.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/79891769384.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7isee5grovmc5jqe28fr672vae/tonejejedowadubadib.pdfIn PDF document text
    • http://hocomesun.com/upload/25413734882.pdfIn PDF document text
    • https://tch.lu/files/files/5123056851.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/gigop.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/83h2fqaee23g46np5eadmbpvth/bilotamav.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/finavegitanobamuvav.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48881102988.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/b9dcq7f876rn1gk1s2krht989q/28623731756.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/46688000853.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/75547970232.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zazawepepinarizi.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/87290289885.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909165443.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/diludamemuruvafevevi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5d84ec01---41118914121.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/36375578960.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/danuridosimezezuratuwupu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/50610159998.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kagipoxeluvimuminititava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=postal+code+lipaPDF 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_off000152e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFB 20532 bytes
SHA-256: 6478366b14c57a3f8e2a39e8192ec9b51d0fc1d402c7f6462329f8237be5ef69
font_02_sfnt_off00019f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F82 10304 bytes
SHA-256: 1b3ae9557b8703938686d53e7556aa58cfc2752b593e0e1b2a169a241107eee4