Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e0af643e3a0c1d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 21:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f4eba25c95e8b73394ed2ccf43883db SHA-1: 500c62d4a4d462ede076c60510d10ddc20909d19 SHA-256: b9e0af643e3a0c1df6ea1d64133f9a009c86ab5af852ed2cf3d6d9d837bb7f73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are commonly used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=camera+hack+termux PDF link annotation
    • http://erbamedica.org/userfiles/files/84559026606.pdfIn PDF document text
    • http://cl-pub.com/files/files/pimutaruw.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/37344235246.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb65d5af56---dujuromotezo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1a3ec13072eac869bfa350faac08ef3e/rusunulasituzidededizufi.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nadifu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rikozupe.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/93485955070.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92442234886.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/bijikitobo.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/91216755293.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/18329131395.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/bibukefa.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/roratavakifazozivosigaza.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kobavuwigiv.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/68244705850.pdfIn PDF document text
    • https://ptogel2.com/contents/files/82528376005.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210904_901D797490C6F250.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630935312.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/34a450e20e97d04833b9c9b25eda4f83/88539023893.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/87677177280.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/panuku.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9fa159a500f958c6daca9d87309f49cf/xadusasipixoniribiberulav.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/femovabawuzu.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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 21224 bytes
SHA-256: da003cdca163b8f36cd4524480208f47a0b64aaac398d61a50d51e1c87760369
font_02_sfnt_off00012a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A86 10288 bytes
SHA-256: abe1ad4e5fb86d7af1f6e53b48ad4c5db2bc1fd9e4aea15673043a3ad126167d