Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c058df1d675103…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 02:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14eb7aa7403f6dd6811004cd4b2717a3 SHA-1: e267abf077b3197d889e9ba6595b0aa9a3f3e189 SHA-256: f8c058df1d6751032d8aac2ebbf382889a8a9659b48620fd41ad35368ddb1d55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded JavaScript indicate it's likely used as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=vienna+sheet+music+pdf PDF link annotation
    • http://cudicio.it/images/file/duzupi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613970224193d---xofesupezilemunikoxam.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/surureziwira.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/45c8dd2378c79b517d48eda75695e7ed/pelelatanadudedirod.pdfIn PDF document text
    • https://hojoairport.com/images/file/vosizalomumenesisaron.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12534656760.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/17456763593.pdfIn PDF document text
    • http://njxinbell.com/upload/files/legamivor.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac057a2c35---99966899427.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/97953951531.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0aa9339bcaa5c90fcc4bdc8e004cec73/mixuziret.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lodiwifig.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/24fbb51675c908f69839dffdecb71b77/dupubewitedapexawafike.pdfIn PDF document text
    • http://taksis.lv/taksis/userfiles/file/kaxejabonetelekatazado.pdfIn PDF document text
    • https://inks.bg/userfiles/file/damatofobuvukejagat.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/mekalomuzu.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/96653503411.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/3527447044.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb293b7e9---repajaker.pdfIn PDF document text
    • http://packturf.fr/files/68912662677.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/40611790035.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/88993072670.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb57ca7307---72742084774.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fazuwolal.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kuvuja.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/25539608540.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/foxuba.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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 10688 bytes
SHA-256: 0c51d6ef0f81452a6d45619b9f0777d3aacf7e38657c4aa73ec77223928e67ac
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 18584 bytes
SHA-256: 0d6207a3a3cd7d531b9d05afa61cd60978292dd593b937170f58cf6842a95cf4

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