Malicious PDF — malware analysis report

Static analysis result for SHA-256 2459064288f99951…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 11:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c05f4e757afd8eaa260e397c34268cc9 SHA-1: ead23ab189f983c32c1f20eefe93de952ecb8341 SHA-256: 2459064288f999517c760467d1960ac6afda88d853614e532ef0f5c7ee3119e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=real+wifi+password+show+app PDF link annotation
    • http://bctlorraine.org/userfiles/file/92217773341.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/72537752579.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/jobavibasupidotonidi.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/31164171703.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9cc4c66ff---davokagigupanad.pdfIn PDF document text
    • http://grossbuch.com/upload/file/24818318153.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/s85h791om5uvkun7j3k1a8u757/jenivusemenuvuwubivuvoda.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/nibosotetezax.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/molubabuvupiwodoz.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/5613155217.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/varixopusuzolib.pdfIn PDF document text
    • https://eguiders.com/uploads/66739298958.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/49196186585.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/35371689915.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/35187449010.pdfIn PDF document text
    • https://proia.bg/userfiles/file/misotalolevosozobajur.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/48418352184.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd016e4e39---wisadozoxoj.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/56168287630.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/1230499995.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/92823849888.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/2200577957.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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 10524 bytes
SHA-256: 1533b98a3e6cf8a634fa0be3f7d65a3314c65c0a03bf27f742c844d53c0734b9
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 15460 bytes
SHA-256: 11efe83e8cbf183bfbd614241b74e341be2d04d17e011a3295d70aefc309e70d
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1